I'm pretty sure that BoTD will not end if you use other moves - it's SE's way of implementing a combo; when you do Chaos Thrust, you gain the effect of Sharper Fang and Claw. You then have this buff for 10 seconds, and it allows you to use Fang and Claw. If you use a different move instead of Fang and Claw, you lose the buff. Same thing for Wheeling Thrust. Let's give SE some credit guys