Jack uses a metal detector to sweep Wallace. The metal detector beeps several times. The Kel-Tech metal detectors only vibrate, they have no audible alert. Also, Jack's using the device upside down. The thin half is actually the sensor and the thicker half is the handle.
Carrie brings the medic back to the hallway to diagnose Tony's injured ankle. While Tony and Carrie converse the whole time, the medic makes the diagnosis of a sprain or a torn ligament but didn't it's broken, all without removing Tony's shoe or sock, or asking him if he's able to stand, or flex or feels pain when she's prodding it.
In the previous episode and in the "previously on" scenes from this episode, it is shown that Tony sprains his right ankle after being punched by Jack. However we now see Tony on crutches and his left ankle is the one hurt and in a walking boot.