Absolutely no excuse at all, if he couldn't handle them then he gets help and classroom management is sorted out.
I was at a Careers Fair 2 weeks ago where around a 1000 year 9/10 & 11s go to.
When I got there I noticed a NHS stand next to the 4 we were going to setup but hadn't got a clue who it was but eventually I spoke to the bloke and he was related to another Trust.
The kids came in and one stall had got balloons which were being blown up and some were being burst.
The bloke from the NHS stand asked a lad not to burst another balloon and you knew what was going to happen.
A balloon burst and the bloke ran over to the 14 year old lad and in front of around 100 students and 30 staff he screamed at the top of his voice "You little b******, if you do that again I'll take your ****ing head off, in fact let's go outside and sort this ****ing out".
The teacher came over to ask what had happened and the bloke said "That little **** there, I'll ****ing kill him"
At this point everyone in the room was

and the bloke walked out.
Within seconds I'd got staff asking if he was anything to do with me and a 1000 other questions.
He eventually came back in, saw people talking to me and when the kids had gone he called me over -
I've heard you've put a complaint in against me
No
That's what I've heard
I stood right in his face and said You'd ****ing know if I'd put a complaint in now **** off. What you did was so unprofessional and I won't be surprised if the school put a complaint in.
About 1 hour later I get a phone call off my manager because HR had been in touch thinking it was me threatening the kid.
The bloke is suspended and I hope he never works around children again.