Spiritfall Gate teleport

Tl;dr version
1)Can a cleric legitimately teleport up onto a gate?

2)Why did asmodian guards start to aoe sleep all asmodian according to my battle log?

Explained version
Yesterday Elyos were attacking the "Spiritfall gate" in Gelkmaros (located near Spirit fall forest), this gate is blocked with a door, and goes across the entire path creating a block against invading players.

There were more elyos and as such they were located at the bottom of the gate attacking guards/PC's coming into their range, some assassins teleported up to attack, all normal so far.

I was then quite surprised to see a Cleric teleported up onto the wall and begin killing, as far as I know, Cleric's have no teleporter, and I am quite sure there was no templar nearby that pulled the cleric up.

What I would like to ask is is this normal? There is a skill I have missed that allows teleportation or it is an allowable bug exploit?

The second strange thing was after the cleric had been up onto the wall for a few seconds, according to my battle log, the asmodian guards started to aoe sleep all the asmodians there. Again, is there an explanation for this that I do not know?

Thanks in advance.