Turn left and learn the rules.
Jammer A is sent to the penalty box. Jammer B is then sent to the penalty box, releasing Jammer A. But oh no; Jammer A is sent back to the box before Jammer B is released. What happens?
Both Jammers serve 10 seconds and are released
Jammer A serves the same amount of time as Jammer B, Jammer B is immediately released
Both Jammers are released immediately
Each Jammer serves their full, remaining time, and there is no Jammer on the track for a short time