Only Romeo would measure responsibility by how tired someone is..

But it works out in this case. Not that Madoka likes being in charge, but in this case she's totally ready to take that role upon her. Sometimes she has to look out for Romeo, when they're in a situation where he seems to have a disadvantage that she personally doesn't have..!

"Alright! Maybe we'll get lucky and the birds won't get too close by.." But that's just a hope. The possibility that they will have to deal with at least some birds is very real. "Let's first head in this direction and see if there's any of the animals over here!"