I can't say I know the structural strange of quasi-medieval fantasy buildings, but that must have been a fair powerful grenade to level a "few" houses. It's not like those houses are made of twigs or something, I mean hell, if it's strong enough to level a few houses than I'm sure there's a lot more damage than just the initial explosion. That's got to be strong enough to rip people apart if they're close enough to the blast, or even get shredded by the shrapnel. Even if it's a slum shanty, you'd think one fragmentation grenade wouldn't have the sheer concussive force to blow down houses it's not even near. And what caught on fire exactly? Or was the place already on fire? because from my understanding there are two places right now that are massively on fire, one which is where you're at, and another where that masked mad man just left from.

Killing one or two people in their homes or in an alley way is one thing, but damn the security is shite if they can't catch someone who just blew up a few houses and set a whole building on fire.