Ntaj got to see one explode right in front of him, when a hurled kunai took it out. Same for the others that Keystone and Kyra took out before the wall came up. As for the rest, he can hear them blowing up from the other side of the ice wall, as well as the ice wall itself partially collapsing. 

The tent, though - not sure where it was set up in the first place. I'm assuming it's near the fire, on the friendly side of the wall.