Careful to make sure they didn't get inside the barrier that would keep Cas from sensing them, even though he could see them, Ben made sure he ultimately caught his grandma with both of them still in the part of the driveway that was close to the street and thus unprotected. But that was the last consideration he had as he latched on to Mary.
It was awkward, trying to cling so tight, at at least part of his brain was apart of the 'don't crush Megan' aspect, but Ben clung just the same. He didn't want to think about these two people two of the very few, if only, that he had left. He just wanted to think about being home again, with her.
A grin was tossed back at Cas for that vaguely proud-like thing he detected, but his focus mostly remained on Mary.
"Grandma, I'm fine, I just had to run through a forest," he said dismissively, pointedly ignoring that she likely meant the mark on his cheek.