The first grab was worse than the second one. He clearly held him up and slowed him down so that he couldn't run the route in the time they practiced. The defender even admitted so in the post game.
Funny how you think that a play they practiced all week long was overthrown by several yards and the defender didn't affect the play. A little hold was all. Mahomes just over-throws receivers by 5 or 6 yards all the time. LOL.