The four laserbeams you see to the left are doors. Doors are like normal walls, except they disappear at regular intervals. Doors can provide access to certain locations when they're open, and they block the way when closed. Doors are mainly used to improve the defensive strength of a structure, keeping the enemy out, and giving the defenders more to recharge and prepare for the next wave. When a door is closing, and your ship is in the way, then your ship will simply be warped regardless of your energy level and regardless of enemy antiwarp. If you are carrying a powerball, then this is the only way of taking it with you when you warp. This is a neat trick to pull off in the Powerball zone. Doors are also a neat way of getting out of an enemy base when you just grabbed all their flags. The enemy will have engaged antiwarp to keep you from warping out, and you probably won't have full energy anyways. Just wait for a door to open, move on that spot, and select the guy you want to attach to. As soon as you are warped out, you can attach to your teammate who safe and is waiting in your home base. This trick is used very often in zones like A Small WarZone for example.