If a titan uses a movement ability, like shield bash or shiverstrike, and is hit with pocket singularity, it will add to their momentum, essentially just killing you faster, or launching you off the map if the hit lands
Also if there's a ghost in between an enemy player and a cold snap grenade, it will just stop, for no reason
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The easiest counter to pocket singularity... a slide! Thats all thats needed to stop it from pushing around an enemy. Shield bash, icarus dodge, or other movements also seem to negate its effect.