Zacs' Cell Division(P) is bugged.
EDIT This is the second time I've posted this. When bloblets get low hp (right before you die in passive) Zac gets up and can walk away, no matter the duration. Zacs' passive is supposed to last 8 seconds, but if killed fast enough, it is shorter. You can see this by spamming Zhonyas, or spells while blobs die, this allows you to zhonyas, then flash away, or just cast your spells right before you die for additional cc before death.