I haven't figured out a way to exploit this positioning yet. (I haven't tried pulling arch from here)
But heres a nice spot to hang out pre-raid and confuse other members. This could possibly be exploited in some way, but I'm more of an explorer rather than an exploiter.
Anyway, the picture should be sufficient for explaining how to get up. If there's any confusion, let me know and I'll give a bit more detail. It's pretty simple though.