Here it is, working now
THUNDER KNIFE
What it does: when human player purchases it, he will receive knife that crackles with electricity.
If zombie is slashed with thunder knife, he will die instantly.
Nemesis is immune to thunder knife
Update: lightning strike is now much more larger
TODO: Model for thunder knife?
Credits: fiendshard, Mercylezz, abdul, vechta, nikhil, laci, nido