[null and void]

In other words, the guys in the tent would all be dead. False report?

[spycatcher]

I think the grenade heat is fairly localized. No doubt they all could have died had they been trapped.

[Aquinasfan]

In other words, the guys in the tent would all be dead.

I had to reread it carefully myself. It sounds like the tent was set on fire by the grenade. I saw one of these things demonstrated on a cable show. It's not an anti-personnel device or a napalm equivalent. It's designed to create extreme heat (molten metal) in a very small area. It's designed for sabotaging equipment.