H (definitely not 'd'h) had been drinking bottled beers at home on Sunday afternoon.
He then decided to go to the supermarket as he often does on a Sunday afternoon to buy more bottled beers and some food items for his own personal consumption. (Money is not the issue here, so the shopping thing is a red herring but bear with me).
He was gone for several hours and I suspect he went to the pub for a couple of hours as when he came back he smelt of beer.
I was giving the kids some tea at this point and he dumped his shopping in the kitchen and hung round the table in the dining area adjacent to the kitchen winding the kids up ended up annoying ds in some way and ds told him to go away. H can be very annoying under the influence as he pushes the kids until they snap, I usually walk away but the kids were at the table eating. Anyway he wouldn't go away and was leaning in to them invading their personal space so to speak and ds pushed him away but it was like a hit on h's chest rather than a push and with that h had him pinned up against the wall with a chair and said "d you know what I do to people that hit me..... I headbutt them" and proceeded to bash his head against ds's which bashed back against the wall. Younger child was yelling at h to get off ds and leave him alone.
Ds was shocked and we all kind of yelled at h to stop. He started to tell me it was my fault and if I didn't start to... but never finished his sentence.
I reassured the kids later that h was very wrong to do this and checked ds wasn't injured.
h didn't speak to any of us for the rest of the evening as kids went to bed after a bath/shower.
Has he crossed a line here ? Things have been bad between us, he barely speaks to me at all but I assumed he'd snap out of it eventually like he always does.