Colin and his employer are liable to provide damages to Roger for his injury because Colin was not entitled to hit any person. The elements of the tort of negligence and defences, including contributory negligence, volenti non fit injuria, and ex turpi causa, are applicable in different business situations. The case scenario involves Mark jumping into a pool despite knowing it's riskier to use the pool from 7:00 pm to 7:00 am, ignoring warnings provided by the hotel, and damaging his sunglasses during swimming. In this case, the provisions of Occupier's Act are applicable, but Mark is not entitled to claim damages because he voluntarily put himself in a position to get injured.