there is a bug (atleast I guess it's not intended) with Parasite's Infest. If you get a ranged creep, and you are about to kill someone but you leave the creep while the attack is mid air, it will say "X has been killed by Neutral Creeps".
How to reproduce (in case it isn't clear):
1.) Infest a ranged creep with parasite.
2.) When the attack which would kill your target is mid-air, leave the creep.