Don's face falls a little at that reaction - he really didn't think his concoction was going to be that bad. He takes the vial back and offers it to Leo, hoping his brother will still be willing to take some.

Raph is collapsing onto the other end of the couch when Don turns around, and he gives his other brother a worried look. Did Raph really run himself into such a state for him, when he wasn't even in any danger?

Or - was he in danger? He has the sense there's a lot going on in this city that his family hasn't told him about yet, and their misguided protectiveness is beginning to make his stomach as unsettled as everyone else's.