Basic decision making. The defender is stuck on you, you have the overlap on all day for the cut back to Saka. You've been in that scenario in training like a billion times in your career. Only way you justify not making the pass is if you score. He didn't even get his shot on target.
He does shit like that in actual games too.
Not saying Noni's the answer (I've heard he can be selfish af as well), but hey hey, ho ho, Martinelli has got to go.