I p1ssed myself laughing at the gun.It looks like it was made for Blue Peter out of sticky bits and plastic.The fact that it went off and did not blow up in his face is amazing.
The other gun is the yacht's flare pistol.In the article the woman says she fired several flares to guide the police in a longtail to their boat.
Assassins Handbook 101:
Get close to your target and do the deed.Do not go on board for drinks and leave your DNA everywhere.