Benjamin Dover writes:

If you had ever sat in a real Piper or a real Cessna, you would know that
it is safer for the Piper to climb than to descend.

Neither is safe if you do not have visual contact with the other traffic.

If neither aircraft has visual contact with the other, and no other
information is available, neither aircraft should take any special action. If
visual contact is available, the pilot(s) with contact should see and avoid.
If no visual contact has been made by either pilot, but one or both pilots has
other reliable sources of information allowing the aircraft to determine their
positions relative to each other, those sources can be used to determine what
action, if any, should be taken.

In this situation, it might help to share information on airspeed or DME from
the LAX VOR, either of which might help to locate the aircraft in relation to
each other. I suggest LAX because it's almost at right angles to the SFRA
route, whereas SMO would see both aircraft one behind the other. Of course,
if they are very close, DME might not be reliable.

I've wondered in the past exactly how aircraft coordinate their movements in
the SFRA, since the corridor in each direction is extremely narrow.