I have a hard time siding with a woman who said "I don't like to use my brain" the way Grace did in an earlier episode, or who makes sand angels while her brother digs the car out. Paul, on the other hand, is quite confident about his mental prowess, but had me laughing out loud when he was totally stumped by the raft building task and seemed ready to throw in the towel on the first leg, after all that chest pounding.
Of course, none of that tells us what happened while the were running, but it tells me a bit about who they are, what they think of themselves, and how they are playing the game. My conclusion: Paul was focused on running, oblivious to the fact that his pack might hit someone, and had no real intention of knocking anyone over. He would rather outsmart his opponents than knock them over, and the "bowl them over" remark was hyperbole. Of course Grace was upset about getting knocked down, but because it was Paul, she wrung all the drama she could out of the situation. She overdid it a bit at the dock as well, and it seemed to me that she was annoyed that Paul got hostile rather than flirty.