Hinrich was closing in, he made a good shot to an open Rondo.
Yes he could have gotten the shot off, but Rondo also could have probably made an easy layup.
Marbury himself is still saying regularly that he is still trying to adjust to coming off the bench. 13 years as a starting scorer to not playing for a year, to coming off the bench, can not be easy.
Throughout his career he has always required some warming up when it came to shooting. And he was out for like 2 1/2 quarters before he came in. He probably just did not feel comfortable taking the shot, and saw a wide open rondo.