Hi, that's not so hard at all.. ;-)
Take ome of the source hunters with a teleporter pyramid. Detach him/her from the rest of the group.
You might want to move Jahan a bit upwards the slope so you have a decent view beyond the wall.
Now you should be able to teleport the pyramid guy, aim for the small bushes area near the right side of the gate, should work.
After teleporting, switch to the other pyramid guy and use his pyramid - team reunited again. ;-)