The company was going to give them a cash bonus but then they probably decided that giving it as bitcoins is a cool idea. Of course it doesn't make it a bad act it just like giving euro's instead of dollars. Have they guessed that bitcoin will rise to 900$+ or not isn't important. What matters is that do the employees trust bitcoin? Looks like your friend trusted bitcoin and didn't cash out immediately after having one. Bingo.
Upon hearing the story, I will assumed that OP's friend only knows the idea of bitcoin not that much. Because he got it from the company bonus so cashing it out will takes more days in process since they didn't know where will it be exchanged. Since it was told to the OP, I will assumed again that OP makes some view pointing to the current price of bitcoin so he makes some advices not to cash it out.
By the way to the OP, how your friend received the bitcoin from the said firm?
Well I have clearly written that as a bonus he received it and the firm has always been keen to give high rewards and around 100 were given as a trial. They have good knowledge of Bitcoin it's a finance company, they always keep update with the current revolutions for their clients and all. No I did not advice him, indeed he had told me two weeks back btc would cross 945 before year end and today it did. There's a good story of a frog living in a well thinking that's the only world, but sadly there is a outside world he did not see. You can't just rely on your thoughts, you need to be in the open to see what could be other aspects.