party got stuck inside Cerberus in WoD

Time: around 11:30 GMT
Frequency: happened once
World name: Ragnarok, Chaos datacenter
Character name: Ebil Elebil
NPC name:
Monster name: Cerberus
Class/Level:
Party or solo: party (alliance)
In-game time:
Area and coordinates: World of Darkness
Steps:
1. my party got inside Cerberus for fight mechanics
2. rest of the alliance killed Cerberus while we were inside, which trapped us
3. Had to use Return to resume playing

Edit: it happened once more a couple hours later, but we were able to get out using the zoneline after a while (20-30s)