So what does the employee want? Their job back or compensation? If they have been made redundant that means that their r job no longer exists and the incident (if it happened) is nether here not there. If they want compensation, what they want it for; what loos have they suffered? Their redundancy is not a result of their accident, so what do they want?

Have they tried suing the hotel where they had the accident? If anybody was responsible for this, surely it was them.

Have you talked to your insurer? 

You could just say "see you in court"

If he takes you to court as his employer, are you then entitled to take the hotel to court? Did the company choose the hotel and pay for it up front or did he choose, pay and claim back.

Surely if the latter, he has a burden to show that he chose the hotel as suitable.

In most cases the insurance will weigh up the cost of fighting the case and how much the payout is.

1 of my clients had a case against them last year, despite them protesting and telling the insurance company to fight it, they decided it wasn't worth the effort and paid out. Strangely enough they lost our business on renewal.