My husband beat up our young son and I don't know what to do about it as I just froze

note: we live in a Slavic country from Europe. So please dont tell me to call police. At best they will ignore or laugh. also I want to work through it as it was the only time it happened

My husband has a extremely high stress job. He is responsible for 80% of the company employees, he is the one who puts a final signature on everything and if something doesn't go as planned he is the one who is called out by the HQ. So he has to manage by himself 8 departments. the head of these departments provide him data and everything but now almost everyone is on vacation.

He is lost without his assistant who also needed to take quite a lot of time off as both her husband and daughter were in a car crash and husband barely survived. so my husband is more or less on his own. He had to finish some reports and it took him 5 days. We have 3 children. 8 (M), 5(M) and 2(F). I was busy with the two younger ones and our 8 years old son kept running around although being told several times to just go play outside

He ended up tripping and fell on my husband's laptop which flew to the floor and as if it wasn't enough he also spilled the coffee on it. the laptop won't even work anymore. all his work is lost. on Monday he needed to present that report to the shareholders. That reports is usually done by his assistant so he had had to work really really hard on it and now he cannot present it.

He got very angry and slapped our son so bad he fell to the floor too and yelled at him he is a idiot and called him many names and hit him again.

It was the very first time this happened. He never hit our kids before. He grew up with a very violent father and he kept telling me how he is happy he was raised that way because it helped him get tough, resilient, confident and everything related. I have to mention that he doesn't speak to his father but he says it has nothign to do with how he was raised. His father used to beatt him with a belt, keep him locked outside in freezing winters, as a punishment only in his pyjamas. his mother left and he was raised only by the guy. yet my husband as I said keeps telling me how happy he is that he was raised properly and is a man now

A few minutes after the incident took place I heard my husbnd sobbing in the bathroom. We have been married since we were 30 (me) and 32(him) and now we are 41 and 43 and I never saw him with tears in his eyes. and he was sobbing like a child in the bathroom. I was wondering if he cried out of desperation for that report but I heard him whispering something like : I didn't want to and shouldn't and sorry.

then got out and went for his regular morning run

What do I do about this situation?