This is the second time i've had an issue with an escort, there was an issue earlier in the year when dd was left alone for a few minutes, however, no harm was done and and the issue was resolved.
This time it's ds, different escort service entirely.
They only started in september, he's been at the school four yrs and except an issue at the start (which was resolved by changing bus) has had no problems.
Since going on this new bus (at start of term) he has had three extremely violent outbursts, he can be violent but most incidents can be avoided.
We've had an issue with her before, basicly she's quite 'shouty' and has a very high pitched tone, following an incident at the start of term has barked orders at him morning and afternoon (red rag to a bull time) for minor things such as touching the key hole on the bus 
Also, the bus is very small, only an 8 seater and that's with two extremely large escorts and a driver, ds is asd and does not 'do' confined spaces.
I had found her attitude a problem and whenever I tried to broach problems found her very 'gruff'. Putting it bluntly I took an instant dislke to her, and was wary as with ds you need to know what your doing.
This was all due to be raised at ds's school review on Wednesday.
She brought him back this afternoon, very red in the face and immediately started screaming at me, 'he keeps attacking me, it's only me he goes, he's broke my glasses and I need to get them fixed, and so on. I listened calmly then said 'having heard the way you scream at him, i'm not surprised he's been kicking off' Then slammed the door in her face 
I immediately phoned the school, said I wasn't happy with what had happened or the way she has spoken to ds, blah, blah, blah and I will be taking him (and dd, they're at the same school now) in myself until an alternative is found.
Went to find ds, in his usual position, on the sofa, hands over ears and blanket over head to ask what happened (find the trigger) and give the not hurt speech.
I asked why he hurt the lady on the bus ?
He said the lady shouting, she hurt me.
I asked how she hurt him, he said 'lady dragged me off the bus, she hurt my hand'
I asked 'how did that happen ?
He said ' smacking it' and started hitting himself.
Immediately phoned school again and let them know i'm not happy about this,etc also asked dd who confirmed ds was dragged off the bus and pushed up against the bus
What's going to happen now ?
Does anybody know ?
Sure she won't be able to continue in that job ? There are extremely vulnerable children on that bus, some are non verbal and violent so couldnt tell. I don't think she realised how good ds's verbal skills are as he only talks when he feels like it but is actually a real blabbermouth !
And now I feel like crap for not sorting out the bus issue in the beginning .
