So there's a bug involving blood dripper (Guillotine), When being used together along with dual desert eagle, where if player uses the guillotine and switch to the dual desert eagle while the blade is stuck on the zombie, the damage will default to desert eagle's headshot damage instead of the guillotine damage
for comparison this is the normal damage that the guillotine will do on normal circumstances

Watch normal damage | Streamable
streamable.com
and this is how much damage the guillotine does with the bug. Even tesla zm dies in a few second.

Watch bug damage | Streamable
streamable.com
There are couple players still abusing this bug after the staffs gave a warning not to.