The lethal range of an M67 fragmentation grenade is 5 meters or 16.5 feet. Bishop and Torres were well inside that radius when it went off.
On the comment website, the first and third comments have identical phrasing despite being from different accounts.
At the scene of the explosion, McGee tells someone the dead people had burglarized the home. A burglary takes place when someone enters a building or vehicle with intent to commit a crime. Since the package was stolen from the porch without entering the home, it was a theft, not a burglary. That is something a basic recruit agent would know.