I've been rather too close for comfort to wildfires in South Africa. I've not yet encountered them at halitosis range in the USA, but I daresay it's only a matter of time until I do. The video clip below shows how very fast they can move, given the right conditions (enough fuel, enough wind, and nothing and no-one to slow them down).
You may be tempted to think that the video has been speeded up, to show the fire moving faster than it does in reality. I can assure you, it isn't! Wildfires really can move that fast, given the right conditions. That's how some firefighters die almost every year . . . they're trapped by a fast-moving wildfire that cuts off their line of retreat, then burns right over them. It's a pretty horrible way to die.
Spare a thought - and a prayer - for those battling the current wildfires in Texas and other states, that they may be preserved in safety.