Guild Wars 2

Little noobish when it comes to traps. Can someone explain how they work to me? Is it better to have an enemy walk across the trap or can you just drop one right at their feet? I usually do the second method because I can guarantee a hit but am I losing damage? Also, once trap imagery activates is damage done or can enemy still dodge to avoid? Thanks.

It depends on the trap. You want your target to move in and out of Test of Faith as crossing the border deals more damage than the initial spring, but you want people to sit inside Procession of Blades.