The trap is a very useful and effective tool to down a terror. The trap objective must be activated by a lever, and then captured by a player. Once you capture the trap, you can place it on the ground. If a terror steps near one of these traps, they will be instantly downed.
-Don't place all 3 down at once if you don't have a camera. It might be a great defense against the Terror if you put it down as he is getting closer to you. It stuns the Terror, when it would grab you.(if you do it well)
-Put the traps in narrow spaces to make sure the Terror can't avoid it.
-Don't put much traps together, it's less efficient.(except if you already know there is a frost terror, because only 3 traps will have effect of 60% of a normal one.)
-Look out for strange noises! Only the Infecteds can destroy traps in human form.
-In the latest patches, the frost terror might be immune to traps(80% reduced effect), you can use it on your side or to counter it before it happens.