Moving Lasers
From WikiRaider
The Moving Lasers are a harmful obstacle found in the level Area 51, in Tomb Raider III and in the level13th Floor in Tomb Raider Chronicles.
They can cause a lot of damage if they hit Lara, but they can be avoided by crawling, traversing above them, or jumping over them at the right point. The Moving Lasers can appear in sets of two: one moves lower and another moves higher. Passing them requires a good timing in running, jumping and crawling.