Erik's inclination to help depends on a lot of things, the main one of which tends to be his mood. He hasn't been in a very good mood since he arrived here, but he at least understands that if any of them have a chance of survival, they all need to do what they can.

He's walking through the square, passing by the fountain, when he hears someone yell for help. Since he's on the way to nowhere in particular, with nothing he needs to do at this exact moment, and no reasonable excuse not to help. Besides, it sounded to him like it was Claire who called for help, and she's one of those he'd help probably without question.

With just a few steps, he's at the edge of the fountain, looking down into it. "Claire?" A glance into the water tells him what's going on here.

As he reaches in to take hold of whatever's within his reach, the irony's not lost on him that this time he's pulling Logan out of a body of water.