A .5 gram charge of PETN in a micro shaped charge would fit inside a function RØDE transmitter.
When detonated it would have a extremely direction explosive force which would create a clean circular wound with massive internal damage.
The recoil from this blast would be powerful enough to launch shrapnel with enough force for 1 to 3 cm of penetration of vulnerable areas like the neck.
The jersey knit shirt would withstand the recoil of the remaining portion of the RØDE case.
The audio from this blast would be very similar to the frequencies detected originating from under the tent.
The force of the blast would be strong enough to snap the necklace and send it on the trajectory we witnessed.
The bulk of the case would be reduced to tiny fragments from the blast.
We would expect to see a small amount of light grey smoke and a shock wave from the blast but not fire and or burns on the shirt.