It was announced like boss ability, so it isn't bug, but it have few issues and MUST BE FIXED.
1. Range. Warping back half zone away?
2. Target. It warps anything what was around no matter who start fight, i was warped half zone back just because did fly (just fly, didn't peek) over someone fighting boss.
3. Finally, ****** realization of ability. When you warped, boss, in real, stops attack you, it's ok, but you also STOPS attack him and need manually start fight again.