"He's burning through it too fast," Cait manages as she hooks another bag into the port in Barry's arm. "It's not enough."

Weakly Barry thrashes against the restraining hands, trying to get free as Jean Claude moves in, containing him with a pale hand pressed to his chest, bowing his head to murmur to Barry in low French.

"His heart keeps stopping," Caitlin explains as she keeps working, trying to save Barry. "I need more power. Electricity."

"Lightning," Cisco concludes.