Have i said he was drunk? if I have, I apologise. I have said, I believe the officer may have thought he was intoxicated by his presentation and that led to a wrongly formed opinion and a dismissal of Henry's plea-evidenced by 'I think he's going to be sick'. But other things can present as in drink/intoxication-and sadly that is very clear.Instead of trying to do put yourself in their shoes why not just look at what you can see.
Where have you got drunk from by the way. Why are you assuming they thought he was drunk when they’d been told he had blood in his mouth and themselves recognised he was hurt as soon as they entered the scene.
Your narrative has switched from “how could they have known?” to imaginary thoughts they may have had.
Look with your own eyes at what happened and defend what they did, if you think it is defensible
The IOPC will have to consider what was in the mind of the officer at the time-otherwise if its merely objective, why bother interview him? I'm not defending the indefensible. The officer must have an opportunity to present his case and his thought processes as I'm sure you appreciate.