The heel of the palm is still very strong. Any kind of punch, slap, or even a love-tap that is strong enough to knock you down is strong enough to leave a mark/ swelling. Especially coming from a 270 pound man. Maybe he shoved her, in which case, she's embellishing the truth. I'm not defending or accusing him. Not enough evidence yet. I'll jus say, just because we say something doesn't mean we're willing to do it. If the accusations are true, in today's technological age, I'm sure the proper evidence will surface.