He wasn't really bumped, as much as Ingebresten blocked him briefly as he reached the last apex of the turn. Ingebresten ran the curve like a race car takes turns rather than holding a constant line within the lane. Nothing really wrong with that, and you can tell Hocker was ready for it. (The commentator even mentions that it's how Ingebresten runs turns.) If anything, it may have actually helped Hocker as he was then able to pass the Brit on the inside just before the line. Had Hocker got by Ingebresten on the curve, he would have taken the lead early and the Brit may have been able to catch him.It looked like he was trying to kick earlier and the other runner bumped him which set him back then he turned on the jets. Here's some different views and the Cathedral watch party.
It's why the 1500 is the coolest race to watch - especially when you have 3 guys sprinting to the end. Any one of those three could have won that race. It played out perfectly for Hocker, as he did catch the Brit by surprise, and Nuguse ran out of track. What made that race even greater, however, is that they did all of this at world record pace. The top three vaulted themselves into the #7, #8, and #9 fastest performers of all time (and Ingebresten was already #4). That is unheard of in an Olympic 1500, as it is always a tactical race rather than balls to the walls for the entirety. Look at it this way - the top 4 yesterday ran the four fastest 1500s in the history of the Olympics.
Has to go down as the best Olympic track race in history.