Trapper

Basic Information
The trapper is an alien structure available at stage 2, it can be placed on the floor, ceiling, and walls.

Trappers shoot a spit at nearby humans, locking them in place and preventing them from turning for 5 seconds. The trapper can spit every second, meaning it can spit multiple targets with ease. While trappers don't deal any damage they are very powerful when combined with other base defences and defending aliens.

The trapper vision is an inverted cone, getting wider with distance. The cone is also at a slight degree offset downwards.

Trapper placement strategy
Trappers should always be placed around corners where they are well protected but can surprise approaching humans

The trapper spit is also quite slow, so ensuring it does not have to travel far to make contact with humans is vital in their success. Due to the cone like vision, the trapper has the ability to shoot diagonally in multiple directions if far away enough. Considering both these points, it is important to build the trapper at the right distance for the right situation.

Surrounding the trapper with acid tubes is an excellent way to provide damage to their powerful attack.

Trapper counter strategy
Trappers have very low hitpoints, meaning even if they are placed high up they can easily be taken out around corners by grenades.

Due to the slow split attack it can sometimes be possible to strafe jump past a line of trappers with speed.

Trappers will not refresh or fire their spit on currently locked in humans, this allows you a small window to escape after the 5 seconds lock in has expired.