[GAMEPLAY] Blitzcrank's rocket grab is glitched

I'm not sure exactly what causes it, but grabbing someone with Blitzcrank's rocket grab will sometimes fail. They will get snared and pulled a short distance towards you, but then stop short.

The most likely culprit from my many attempts to cause it seems to be them getting "stuck" on a mass of minions, as this problem only occurred in lane and during the final siege of the enemy nexus, where my ally minions were all over. Their models get jammed into the minion models and refuse to move further forward.