NRS 484B.127 Following too closely.
1. The driver of a vehicle shall not follow another vehicle more closely than is reasonable and prudent, having due regard for the speed of such vehicles and the traffic upon and the condition of the highway.
The bike didn't nose dive from hitting the breaks, he was maintaining a safe distance from the car in front and it seems he saw the car to his left getting ready to merge. He was also kind of in the blind spot of the car merging in front of him. "Good, I wasn't sure he saw me and he was coming in." is what he had to say to the officer.