Jennifer's room was large, but it was not enough to accommodate tens of people that were supposed to fight against each other.
It was exactly because of this reason that they had decided to fight inside the highly reinforced rooms.
Before the walls would break down, and finally crumble under the intense force of the released attacks, some time would have to pass.
In that duration, Luna wanted everyone to kill, or at least, severely injure as many assassins as possible.
With only a small door to allow the assassins through, the groups that had been formed earlier could work together to defeat their opponents.
While this scenario appeared to be good on paper, but practically, it didn't work in Jason and Jennifer's case.
Jennifer was much stronger than Jason, and so were her opponents.
Now, it was too late to form a new plan so they could only brace themselves as the assassins rushed through the door.