"No weapons," Thor agrees, smiling broadly. Sure, under more serious circumstances it might be a bad idea to try unarmed grappling with a giant, but the lack of any real danger and the challenge it presents are more than enough to keep Thor's interest. "No magic either, besides your... size-changing thing."

While it's possible the titan could take a few hits from Thor's particular brand of elemental fury, he's not exactly used to regulating it to non-lethal types of current, and given Prometheus' history with thunder gods it seems only polite to refrain from using it against him anyway.

With no need to select a weapon, Thor moves more fully into the confines of the sparring ring he's made, loosening up his muscles in preparation for the fight.