Except that you can't really carry additional weight (certainly not another person). Even a lightweight hose or line would mess up your flight if it was tethere

Except that you can't really carry additional weight (certainly not another person). Even a lightweight hose or line would mess up your flight if it was tethered. As for fires: burning buildings are masses of hot, moving air which wouldn't be navigable (the best you could do would be to land on an unaffected side of the building). Even the Martin Jetpack (the only other nearly-commercial product in this market at the moment): https://en.wikipedia.org/wiki/Martin_Jetpack https://en.wikipedia.org/wiki/Martin_Jetpack is only likely to be useful in a small number of "first responder" situations despite being dramatically more powerful.