Game Mechanics: Summoned in Walls at Phiny in Kedge

[lland]

A few minutes ago while clearing the Seahorses around Phiny, one of them started summoning us into the walls. You know : you're stuck, you can't move, sit, cast or fight. After using /rewind which worked, the mob stayed in wall, impossible to target and ended up gating near Phiny. After that we died from summons.