Honestly it's insane to watch, when a Quicksilver gets a whiff of a spike it starts sliding faster than a Mecha Knight with 4 spikes already in it. It probably draws from the move speed of it's "charged" attack but it's in complete control of it's motion.

It looks like a bug, and if it's intentional then it basically only serves to give the player the least amount of chance possible to grab a spike... at that point you may as well just spawn the spikes on top of them... (but hey... the game already does that anyways)