Ok I am old hand at this one...
Son is now yr6
Dx ASD In yr2 and had been on the merry go round of behaviour from aged 2 until current day.
My son's support has been gradually upped until he now has a full time named 1:1 and that has been in place for nearly 2 years - she is a constant presence tho not necessarily velcro'd. He has lots of intervention now too plus I do a lot at home (always have); plans, routines, behaviour management.
Honest answer?
Ratio means diddly squat.... My son needs support and structure, more of an approach rather than a person. Two, three or four adults shouting would have changed the incident.
Boundaries, structure and preparation might...
My school swimming experience...
Yr 3 - school planned for it and he was supported 1:2 whilst changing and on the bus. It's difficult in the pool but he was a fairly able swimmer.
The whole thing was a nightmare, behaviour downhill and he was very very stressed about it.
Yr 4 - different school. By this point he had met the NC requirements in private lessons which were going well (because I took him home in swim shorts, jumper and towel to prevent using a changing room). I asked school to opt him out of the NC which after some wrangling they did.
Now we can sit here and wax lyrical about equality and exclusion... Normally I am the first but simply school swimming was impossible to manage for him - the whole approach and set up (bus, changed, swim, changed, bus in 1hr 30) meant it was best for him that he didn't go...
However, he had every right to go and school, rightly challenged me to offer him that right, which I took full responsibility for a) declining b) justifying and c) evidencing his NC achievement.
I will add this too; your son was utterly in the wrong. Thursday afternoon or not.
My son put a child in A&E when he was your son's age - there were lots of factors that led to that happening but ultimately I am only interested in HIS behaviour as it is ONLY his behaviour that I can hope to change / support.
I didn't shout but I took full responsibility for ensuring that the incident did not re-occur and it meant removing him from something he liked to do but could not actually manage... Something we went back to 2years later.
Now I got a call last week - an incident at school - fairly serious (an excludable offence in a secondary school) so I banned laptop at home for a day and for good measure I banned it for a further 2 days for lying about the incident. His behaviour issues mean I have to VERY clear, VERY robust, VERY consistent and to him I support the school first and foremost even if I privately think they are wrong.
As difficult as it is he remains your responsibility, even at school and sometimes that is really hard and means making really difficult decisions about his schooling and what he is able to take part in.
Sorry, written an essay... It's hard where you are OP... Really hard - I am still there most days and it has taken me a long time to learn to live with it
Keep going 