There was a half in my neighborhood two weeks ago and they specifically stated repeatedly in the entry form "the minimum pace for the half marathon is 16 minutes/mile, if you fall below that after cutoff you will be required to get on the bus and taken to the finish line". I know someone who finished the half on an injured knee and basically power-walking the whole way in under the cutoff. I have no issues with this guy doing that, he's already signed up for NY, ran New Orleans, just did Sarasota, did Ft. Lauderdale, the guy was just injured so he walked it because he was already signed up, but everyone who signs up to walk them, why? What's the point? What did you achieve? You can show off your 4 hour-finisher medal and eat all the food you don't need, but why do it at all? You're not going to believe your own lies, why not train and do it right?