Looks a bad idea to me. Reason for a fire steel loop on a sheath is that the knife is always with you, so you always have means to make fire, even in an emergency when you lose other gear. Unless there is a snap fastener between sheath and loop, it looks like that is just Begging to fall off. I think that a second sheath with integral loop would be better, then you just swap sheaths if you want the fire steel. Easier to find someone to make a new sheath than to make mods and amendments to an existing one.