In a recently released video of the elimination of an arab terrorist in Hevron, an Israeli can be heard warning that the terrorist may have a suicide vest, confirming the soldier's story that he feared the stabber might activate an explosive charge.
The video was filmed by B'tselem and released by Tsahal radio.
In it, the ambulance drivers can be seen carrying the soldier that was wounded by the terrorists when someone outside the frame shouts: "he apparantly has explosives on him, be careful! Nobody touch him until the bomb squad gets here."
Four seconds later, one of the ambulance drivers transporting the wounded soldier repeats what he heard "the terrorist is alive, that dog. Don't let him get back up! He's alive! Somebody do something!"
https://www.youtube.com/watch?v=S8WK2TgruMo#t=132(warning graphic footage)