What is a proximity option select?

and is that possible to do in street fighter 5.

There are a few proximity block OS in SFV.

The best one I remember was Ken’s fireball ~ VT prox block OS. If they dash into it or if it’s in cancel range you’ll get to extend into a full VT combo. Same on Juri but you get less, Ken’s forward dash in his VT animation makes his really good.

is this useful i don’t see many talk about it