This Strategy can let you no need to struggle to knifed Doctor Zombie without damage
Stand beside the chemical cupboard.
Then run to the operating table.
Doctor Zombie will trap into the corner of the sickbed.
If Doctor Zombie will not trap, run around the room or move out and turn back to the same place and try to trap Doctor Zombie again.
If Doctor Zombie is trapped, stab to its leg 3~5 times.
If too close, stay back to the operating table and wait about 2 seconds.
Do it rapidly.