I should really try finishing this game. But, damn that gas mask running out!
There are times when you just need to run away instead of fighting.
(sorry, I'm Iranian and even though my english isn't bad ,i've never heard of supports in this way and i couldn't find anything in the dictionary
If you don't know what beam I'm talking about - the first one got destroyed when the tank pushed away the metro train. You just need to shot the next one.