Shazier delivered a diving tackle into Kizer as the rookie was sliding down to the ground and drew a 15-yard penalty.
Shazier told ESPN on Friday that he didn't think Kizer was going to slide.
"I didn't see him slide much on film," Shazier said. "I wasn't expecting him to slide. I was just going in there to make a tackle like I do any tackle. It's just part of the game. Sometimes they get you for those things."
Shazier, who had seven tackles against the Browns, said he plans to appeal the fine.