A quick search didn't reveal this as already posted, my apologies if it has and I've missed it.
In EotS, when one of the four control points turns from Neutral to Alliance, the indicter tower turns from grey to blue. When this happens, the tower briefly despawns. If you're on your toes you can auto run against it right before it changes. You need to stop running as soon as you move forward. It's easy to do once you have the timing down. The end result should have you inside the tower.
You need to go to first person view to get a decent view, but once here you can heal/ranged DPS in relative safety.
On a related note: warlock soul well will also remove the flag graphic similiar to mage/buffet table as discussed here