He finally lowered his sword, but he didn't sheathe it; there was still a struggle for control going on and he didn't want to be caught unarmed if it took a bad turn.

"Possibly. Though I can't be certain how long it would hold."

If they'd been from the same world, he could have given a more definitive answer. As a captain, he was able to produce strong seals, but the abilities of one world had the potential to react strangely to the abilities of another. There were no certainties here.