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Half-Life 2: Episode One Hints
Headcrab and Zombine Tips
1 of 5: There'll be two regular headcrabs on the stairs as you ascend them.
2 of 5: You could try out your new crowbar on them, but a better way is to "push" Alyx up the stairs ahead of you so she'll get 'em. (Or just wait in the side area with the supply crates until she does.)
3 of 5: At the top of the stairs, get the crowbar out and whack the poison headcrabs that are in the nearby room. (Poison headcrabs always go through their "hissy" routine before leaping, giving you plenty of time to close for a crowbar attack.)
4 of 5: Right after the poisonous ones are killed, look to the nearby hallway to see two zombines who will charge you on sight.
5 of 5: Shoot the explosive barrel in the hallway so that it explodes when a zombine comes right by it, then get the shotgun out and quickly finish them off. (Or retreat to the stairs and let Alyx help.)