Brain bruising a hell of a lot more serious than concussion though. I played with a kid once who actually ended up in ICU over it and didn’t play for a year. There’s probably a spectrum for the seriousness of brain bruising, as well as concussion as we are seeing with English right now. Most people are feeling 100% from concussion in less than a week, he seems to be having issues nearly 3 weeks on.Yes, I agree, yet it so hard with concussion to know when someone is right. I was knocked out cold for a few minutes in my early 20's. Vomited non-stop for days, couldn't lie down without my head spinning for months. Finally went for a head scan when returned to Australia, 4 months later and had bruising on the brain which would heel naturally in time. Took about another 2 months for symptoms to stop, so a total of 6 months. Could I have played sport after 3 months, likely. Would playing sport after the first knock have effected me. Unlikely unless I got a second knock and there lies the issue. I don't think there is an easy answer.