rational wouldn't be the right word, but even when people are smashed they still have a certain level of animal awareness, and I would think especially wrt cops. I've more than once dealt with people who could barely stand-up but were determined to keep trying to do something they were incapable of doing because they had some fear in their head about the need to do it. It's exactly the same thing as when you can't get a drunk's car keys from him - he's determined he "has" to get to somewhere for some reason. Drunkeness in many people creates a paradoxical mix of high motivation and low capacity - probably why it also leads to so much senseless violence. His impairment was not so high he that he crashed his car or was unable to master his cell phone to make calls.