I vote safe.

Its bad enough haveing a locked safe, cant get the monies!

Its twice as bad as it is flaming

Its twice that bad running down hills, i have bad ankles

Its twice the previous bad if the flaming safe was chaasing me down the hill.

And it would be twice as the last bad to be hit by it, since eventually, id fall.

That is sixteen times the badness of a normal safe!!!!

Terrifying indeed