@Bending_Cheese67, @Ed_ll3, and @CHAOS_AGENT_45, thanks for playing my contract and sharing your runs.
After all this time I've just discovered that the propane tank is not as powerful as the fire extinguisher! Using PT and BC doesn't kill all three targets; it has a much smaller blast radius. My original run used one propane tank, but I was waiting for the band to come off stage (~6 minutes) then I figured out that I could use two propane tanks and got it down to 3:02. I don't normally like to re-do contracts after I've found the best route I could come up myself, but once I saw that the FE could do it in one go I had to go back and give it another go.
Silence Is Golden (0:54) [Suit Only]