Elsewhere, Travis McGee noted that their Rules of Engagement were probably “Do not fire unless fired upon”.
You get a swarm of faster boats surrounding you, and then getting closer, you cant fire without orders. If they come within a few feet and reveal they have bombs that can blow you all up, or just enough firepower to kill all your men, then you have no option but surrender.
That, IIRC, is what the Iranians did to the British.