Challenge - Kill the cowards near the reception without using a sacrifice

0:00:05 - After collect the jump barrel, pause the game and let the crawler jump to the wall.
0:00:07 - Let the crawler jump out the vent.
0:00:10 - Destroy the door.
0:00:14 - After the crawler turn back, clear the path.
0:00:15 - Let the crawler jump to the wall.
0:00:17 - Let the crawler jump out the vent.
0:00:20 - Evolution a zombie to crawler on 1st floor and jump to the wall.
0:00:22 - Let the crawler on 2nd floor jump to the wall.
0:00:25 - Evolution a zombie to crawler on ground floor on left side.
0:00:27 - Destroy the power terminal.
0:00:30 - Let the crawler jump to the wall on 1st floor.
0:00:33 - Let the crawler jump to the wall on 2nd floor.
0:00:37 - After collect the injection, contamination a human in reception.
0:00:38 - Explode a zombie or crawler to destroy the thick door.
0:00:48 - Let a crawler escape.