Hello, my name is XXXXX XXXXX it is my pleasure to assist you with your question today.
Did he suffer any injuries?
I presume nothing permanent?
In terms of compensation you will not be entitled to anything unless either of you had suffered an injury or some losses. From what you say it does not look like this was the case so a personal injury claim is unlikely to get you far. The law does not compensate for what could have happened or how close you came to an injury – it I actual injuries that count.
You may still consider complaining to the owners of the property hoping that they may offer you something out of goodwill but if nothing happens then you cannot really consider legal action in the circumstances.
I fully understand it must have been distressing for you to witness but this is not something that will affect him in any way, for example he will not be psychologically affected by it and there will be no scarring so legally, very unlikely to go anywhere with this, but if you push them directly then you never know, they could try and offer something to keep you happy.
you are welcome, all the best