Laser gun hot shot not make any damage on environments, but kill enemies behind.
If your target on enemy health bar, the hot shot fire opposite direction.
My mouse target on the yellow arrow.
Same problem, standing on door:My target on yellow.
I encountered a similar bug with the plasma cannon. Anyway, the hot beam doesn't seem to hit correctly all the time. One needs to exactly hit the chest of the enemy, hitting them at the arm doesn't seem to be enough. So I guess they should slightly adjust either the size of the hitboxes or the AoE of the beam.