But she wasn't in his way, she wasn't a minor obstacle in his path, he moved over towards her to shove her, and it was a hard and deliberate shove. It's like those people who push strangers off train platforms into oncoming trains.
He was said to "ignore" her calls on his way back past which suggests he was aware of them.
And he could hardly have failed to hear about it, or see the footage of himself, in the months and years that followed.
Sounds like your average sociopath.