The third point of view:
Isabella didn't trust Jennifer behind her especially when she had a gun with her. Just because circumstances forced them to work together doesn't mean they were friends now. Jennifer still pretty much hates Reina - she set her up in an accident - and what better way to have revenge on Reina than to end her.
Jennifer didn't trust Isabella. She was Reina's daughter and would want to hurt her for trying to hurt her chosen mother, Reina. Even while she had been engaged to her father, Niklaus in the past, Isabella never liked her. She only tolerated her.
Suddenly a boom came from downstairs and they all shook unsteadily on their feet, smoke slowly filling the room.
"We can't stay here any longer with the fire increasing. Also, what if it triggers the rest of the bomb and then, we're good as dead," Neon hoped to talk some sense into them.
