a)
1. Fight with a zombie, and wait him to raise his hands, then run away fast.
2. The attack will hit you wherever you are, like if it were desync even with 0 desync and good ping.
b)
1. Atract a zombie into a house
2. Sometimes the zombie will attack you from the main door hitting you like if you were in front of him even being 4-5 meters away.