[GAMEPLAY] Brief freeze on the attack that would cause your first death in every game

Basically, when the attack that would result in my first death begins, the game freezes for about 200-300 ms. Note that the freeze occurs when the attack begins, not when it deals damage.

I originally thought this was a brief freeze upon death, but I've had instances where a Lee Sin Q that would have killed me, but missed caused the freeze. The same applies for targeted abilities from long range (i.e. Annie's Q); the game has unfrozen before it lands, giving me time to use an ability or summoner to prevent the death.

Repro is pretty straight forward, because it's 100% repro. Just go into a game and die to another champion. It also doesn't seem to only happen to me; I've encountered a few other players who experience it, as well.