RedactedNarrative: Vessel #1 struck the East Jetty rocks catapulting all five occupants into the water.  No one was wearing pfds's.  Vessel #2 witnessed what had occurred tossed five of his own pfd's from his vessel to all persons in water and the persons in the water put them on.  He then positioned his vessel between the unmanned vessel and the persons in the water in an effort to prevent the vessel from striking persons in water.  Unmanned vessel #1 struck vessel #2's outboard engine twice and on the 2nd pass disabled his engine.  Passenger on vessel #2 hurled himself from vessel 2 onto vessel 1 (about five feet) and turned the key to kill the engine and would assist all 5 persons back on board vessel 1.  All parties would eventually be escorted back to shore by the USCG and Harbor master.  Operator of vessel #1 was injured.