First of all, it happened in the office, that is, at work. Your master's child appeared in the office while you were at work and hurt his leg holding you. It's not your fault, but your hostess didn't take good care of the children. Your master won't blame you if he is reasonable.

Secondly, if your host's children are often naughty in the office, I suggest you clean up the iron filings when you enter the office next time and always pay attention to the children's movements. If it is close to you, remind him that you may have iron filings and ask him not to hug you.