Nancy says Abdullah claimed full responsibility for everything that went wrong at the dig. And that's pretty darned lucky for us, because there isn't any direct evidence about who did any of the bad things that happened. Jon's concussion might have been caused by a lose brick in the sandstorm; the collapsing tomb walls might have been due to the age of the place; the snake might have wandered in from the desert looking for a cool place to sleep; the punctured water tank might have been done by Dylan's shady friends. Or they could all have been done by Abdullah, or by Lily under Abdullah's orders, or by Jamila, or by Dylan, or by Dylan's buddies, or even by the mythical Annunaki. Who knows?

On the other hand, I wouldn't trust Lily to water my houseplants. Anyone who could seriously say to you, "No more taunting the curse!" has definitely got a screw loose.