Knocked out of bounds on Djinn's Dominion (PvP)

[Kipbrader.9207]

I was just knocked off the arena in the Djinn's Dominion PvP map. It happened in the north-west between the northern and north-western capture points (see screenshot, if I successfully uploaded it). I was fighting an enemy over there who used some sort of knockback skill. I think it was a mesmer, but perhaps it was the hunter that I am targeting in the screenshot. I landed in the water (which broke my fall) and could swim quite far into the scenery as well as deep under the arena. My team lost the 4v5 battle that ensued.