From the air
Watched them many times but rarely over flat ground..most interesting was for nearly an hour about 3 kms away and at 2,500ft agl whilst paragliding from Mont Bouquet.
They flew in a sort of holding pattern with the lower leg into wind and adjacent or over the fire apparently awaiting orders from the ground.
Many moons ago I watched them from a layby on the old RN 106 where they pulled up to 60ft to drop the retardant. I was within 400m.
Incredibly skilled.
Sadly most of the fires are set around my area and has included idiots who use flares attached to one tree with a trip line to the second which operates when the mistral blows.