Wasn't there a Navy seal on Joe Rogan going on and on about movies and how they're bullshit in their portrayal of soldiers and shit. He was especially salty about grenades saying that their fun but don't cause fiery explosions.
That is a flash bang concussion grenade, they are specifically designed to do exactly what that one did, make a large flash and concussion disorientate the room and including blowing the door open. A fragmentation grenade on the other hand doesn’t make much flame but will fucking kill you.
I’ve seen flash bangs go off and if your not wearing hearing protection you will absolutely lose your hearing and it will absolutely clear out your sinuses we did it in a field and I was about 10yds away and it scared the fuck out of me