Doesn’t add up

"What do you mean they are gone"? Kane snapped at JJ's words who apart from saying "I have some bad news" had mumbled, "They are gone".

"Who are they"? Xander asked, taking the news a bit too well, although that might be simply from the shock. 

"Them. Everyone. Everyone… everything is destroyed" Trying to hold back his tears, JJ declared. 

"Can you tell us exactly what happened? From the scratch"? Xander asked. JJ took a few deep breaths, and yet he was hesitant to speak. It took him a while, a few tries before he could recount the horrible events to the duo as he felt suffocated with every single breath.

"So we won"? Kane scoffed. "But at what cost"?

"All the Lysserions are dead, but so is every one of us"! JJ snapped.

"Are you sure whatever caused the disaster had a nuclear source"? Xander asked, still not angry or upset or anything. 

"Yeah, I am pretty sure but, why"? JJ snickered. "Does it matter"?