2nd grade son had his took knocked out while playing tag. bully 2wks later said he meant to do it. should i be worried about psychological well being?

Yes, bullying has: been in the public eye lately, and the studies have been around more and more. All state bullying is bad and causes a myriad of psychological reactions, including suppressed anger, anxiety, decreased academic performance, social withdrawal, etc. Report the bully to the school officials first, then coordinate with them to deal with the parents. Follow up with an appt with a child psychologist