I like Thor’s post here
In a Versus you can declare the stakes as “I kill him,” but so can they. In a BVT, you can’t kill him without the number of successes. So, BVT is a good way to resolve a fight when you don’t want to risk dying on a single roll, but are willing to risk wounds.
As for Task and Intent in BVT, remember task has to match the intent. So, sure you can get your intent, if it’s getable by being stabby.