Actually looking at the pics I think he may have a bigger problem on his hands. It looks to me like the crown may have actually separated. You can see the sleeve still in the crown tube. I have seen this with many different types of spring loaded crowns, although typically PAMs. The outer and inner portion separate with the inner portion remaining attached to the stem and the outer portion just coming right out. Here is an example of a PAM that I repaired recently.
In this particular case I was able to reassemble the crown but it depends how it failed.
So best case for your friends SOH is that the crown can be put back together and all is good. Worst case a new crown will be needed, which may be hard to source. In either case it is best to send it to someone who can deal with the repair one way or another.