Given how breathing styles are portrayed in the anime and manga you'd think that when using one it would be a struggle to pay attention to everything around the user but it's actually not all that hard.
I hum quietly to myself as I continue bending the laws of the universe over my knee by creating something from nothing with the with the same amount of effort it takes me to breath, 'oh that's a good idea' I grin to myself as I pull a trick from that one universe controlled entirely by who can asspull the hardest (baki).
As I continue refining the breath of the Blade I start to lose myself in the process and stop paying attention to my surroundings other than Kiba as to not hurt the young devil. The more I progress with the style the more the weapons being generated seem to get progressively more ridiculous in their scope, I don't even realise that some of the weapons are ones I know from other universes like the blade currently in my left hand.
With an effortless swing I slash at nothing with the blade of Olympus before it dematerialised in a cascade of fire and transformed into Balmung, another lazy swing generates a wave of anti-dragon attributed destruction that is only nearly contained by the sort of reality marble created when I started using the breathing style to its fullest.
For little over an hour I continue using the breathing style to its fullest and making logic and the laws of reality sit in a corner and watch me do so, with every swing of a new sword the style refines to perfection until with a final swing that I put actual effort into spacetime is cracked and from the crack I pull the very concept of a sword from its place in the root.
What I pull from the hole isn't able to be described by god or mortal as all who look at it will see something different but all will tell you that it is the very epitome of a sword, and it is with this concept that I slash one last time aiming for a specific time and space.
"Blade breathing 10th form, THREE FOLD SLASH"
it may be an underwhelming name but that is all the form is, it is three slashes made at the very basis of what you are targeting. the slashes using the sword aims at all that the enemy is, was or will ever be, each slash aiming at a different target the past, the present and the future.
When I swing the sword there is an effect almost like the World hiccups before what's left of the foliage Infront of me is erased from all of time and the area around me (and Kiba who I made sure was behind me when I did this move) was, is and will always be a wasteland (it doesn't effect memories so people remember the place as it was but also have new memoried say this is how it's always been here)
With the task I set out for the sword done it shatters into flakes of light and retreates back to the Root. "Hmm that was a good workout" I say as I stretch out my shoulders and my back, when I look over to Kiba he looks like I just I simultaneously told him the kids that died for him are now alive again but also like I just told him that the entire holy sword project was his own fault, that is to say he looks elated and also incredibly constipated.
"So is that enough to for you to try making the homing sword or should I demonstrate more" that really lit a fire under his ass because without looking away from me of the area an absolute monster of a sword is birthed from the ground before it's launched at a fleeing demonic beast with a scream that sounded like that one geometric motherfucker from neon genesis Evangelion reguel or what ever.
Then with a sound that rang out like what I Imagine divine lighting sounds like the entire area around the Beast is detonated in a column of thunder and force.
Huh so I guess watching me casually destroy any expectations of limits he thought swordsmenship had also was enough of a trigger to slingshot his sword birth control from creating elemental swords straight to creation and manipulation of all demonic sword based objects and weaponry (there is a difference between the two)
I give the current shell shocked boy a gentle smile and thats what breaks the camels back as he rushes closer and launches into a flurry of questions on what the fuck just happened.
"What was that? How did you create those swords? How did you make holy and demonic swords? Are you really going to teach me how to use that sword style? And what was that last weapon?" I flinch slightly from the sudden onslaught of questions before I raise my hands in a placating gesture and slowly work my way through his questions.
"Ok first off that was breath of the blade a breathing style centred on versitily intented to be used by somebody able to generate swords of differing sizes and styles, secondly I have absolutely no idea but I suspect that it is an incredibly advanced but limited form of senjutsu mixed with my natural talent with the sword." I take a breath to continue.
"I was not aware I was making any special swords and was only trying to make one at the end when I pulled that sword from the spacetime crack, I do intend to teach you the breath of the blade but I may take a very long time until you reach my level (if you ever do wasn't said) and finally that was the sword" the moment I spoke the word into reality I saw Kiba flinch and I didn't blame him as I'm pretty sure I just pulled a trick from the shards in worm by commencing all that the sword is into a single word.
"Ah my bad I didn't mean for that to happen but I hope you were able to get some of that" he nodded slightly but I did notice he was a bit dazed so I lightly pushed him to sit on a nearby rock so he can recover from no doubt a small brain aneurysm that (imma just call it this) shard speak gave him.