the explosive device was most likely planted under a certain amount of dirt with the mechanism to fire it attached to the flag so that if it was pulled, or kicked in this case, it would trigger it. You'd want enough dirt on top of it so it doesn't also get yoinked out with the flag without going boom, so it'll have a bit of topsoil on it to keep it tucked way.
So you think the red was dust? There’s a part of me hoping it was mist, but that really didn’t seem large enough.
the explosive device was most likely planted under a certain amount of dirt with the mechanism to fire it attached to the flag so that if it was pulled, or kicked in this case, it would trigger it. You'd want enough dirt on top of it so it doesn't also get yoinked out with the flag without going boom, so it'll have a bit of topsoil on it to keep it tucked way.