I can cut out the air burst part. Seems dodgy to me as well.

But i can't agree about the crouching. If you see something speeding towards you, what do you do to brace yourself? Right, bring yourself lower to the ground. That's not multitasking, more like a reflex. 

About the slash: he were already preparing to strike, so the thought of transitioning one attack into another would come naturaly to him, and as he fights with daggers and shortswords, weapons meant to be maneuvrable and fast, it would be suprising if he wouldn't be well-trained trained in that particular field. So that decision could come fast enough as well.

And the dagger stab is also pretty simple to explain: the dagger was initialy held there to parry or counter, and as countering an attack as a means of stopping it is normal in swordplay (swinging a sword at a sword), this also could be nigh reflexive. And not ripping the dagger out of the boot would actualy be counter-intuitive, as having your hand jammed between your stomach and someone's foot, along with the dagger's pommel would be very undesirable. The hoodie and longcoat would provide some amout of protectction, letting Vos avoid the pommel damaging him, and also decrase the amount of friction between the pommel and his body by sliding one against another.