Leonardo closes his eyes as he listens. In a way, it sounds like Wan is agreeing with him - they fight because they have things, people, they have to protect. But whereas Leo will run to meet their enemies halfway across the battlefield, there's something about Wan's phrasing that makes Leo suspect that he fights not because it's in his blood, but because he must.

He's not about to go pushing just to sate his own curiosity over whether he's correct. But Leo knows a person weighed down by the burden of responsibility when he sees one.

"A world is a heavy weight to shoulder," he points out, his tone carefully neutral. Another part of Wan's phrasing - what the world stands to lose - makes him think that there's more going on here than a metaphorical discussion.