Ritual Mob Stuck inbetween instance/non instance space

Bug report 1503150378

Summary

Upon engaging my ritual content in my map, at the very end there was a single mob, a totem, stuck in the upper right area inbetween the ritual zone and past the black "non ritual zone" I tried attacking the mob via ranged spell, but was unable to. Had to TP in and out to disengage/fail the ritual and the totem was still alive when I came back in the tp. Was also using deli on mirror device.