With respect, Monrad, but there is no such thing as "no chance of spreading...".
I get a chuckle out of that line, and I've heard a few really wild excuses for the fire spead coming from the "perfectly contained and managed little fire".
A few that come to mind:
"It was only a few sparks from some leaves that my son threw on when I wasn't looking - they must have blown in the wind, and caught the dry grass across the road on fire. " (This one caught a hay field on fire, 12 acres burnt, and we managed to stop it at the creek. )
"It was only a little bunch of sticks." Windy day, same little sparks, 3 1/2 acres, straight up the hill. A patio saved the house, and 2500 gal of water, 12guys with rakes and backpack blowers and a bulldozer saved it from spreading to the adjoining National Forest and neighbors' properties. All this in an "exclusive, gated community" of 500K + homes.
"We just wanted to burn out the fence row, so we plowed the field side, and figured the ditch and road would stop it on the other side." Turns out a rabbit got trapped by this one - rabbit eventually got singed, and ran across the road, with his pants literally on fire. Needless to say, this got out of hand really quick.
I'm sure the paid firefighters and the volunteer firefighters (like me) could add many more.
Maybe, in your case, the boys with the big hose overreacted.
In my neck of the woods, we've got too many chances for thousands of acres of trees to fall prey to some hillbilly dope burning trash in his backyard. Some people here are dumb enough to burn the weeds under their propane tanks. Takes me ten minutes to get to my station, start the brush truck, transfer gear, and get on the lights and siren. Then one and half lane twisty, hilly gravel roads to wherever these dopes have planted their ratty double wides on some overgrown parcel of land. They are out in the yard, screaming because their porch is on fire - they were frying a half-frozen turkey on the porch. Hot grease and old wood aren't a good mix.
Fire response from the paid crews in town takes 20 minutes at least, I beat them there by five minutes at most. Fires tend to double every 30 seconds - do the math.
Sorry if I sound like I've got no sense of humor on this topic. And -Agent-, Let me know ahead of time if the fire's at you place, I'll plan appropriately.