Slowing or stopping Extension.
Stopping extension from building to building through air spaces between structures has been a problem since the dawn of firefighting.
I have been kicking an idea around for a while now that may help remedy this long standing problem.
First connect to the roof standpipe outlet of the buildings on each side of the fire building with one length of hose line with a three way or four way y at the end. Connect the needed amount of lines to those lines and put a Bresnan type cellar nozzle on each line. Drop these over the edge of the roof cap into the air space to create a waterfall that will both cool the atmosphere between structures and protect the adjoining structures.
If a roof standpipe is not available move a supply line up an Ariel Ladder.
Make sure to place a salvage cover or some other protection on the edge so as not to allow the vibration of the line cause damage to the line.