You are suggesting he do this alone to a physically superior man with a unknown number of additional intruders in the house? He should approach and come within reach of this known criminal, because YOU are certain he couldn't move after the first shot?
Should he ask him to hold his gun while he uses both hands to tie the knot.
He just shot the guy in the hip with a high power rifle that just he fell down the steps and was laying on the ground injured.
He had the strength to drag him into the other room and then put him on a tarp, but couldn't find a roll of duck tape, flip him over and tape his hands???
He wasn't a former preschool teacher but a former security officer for the State Department. The answer to your question is: YES
Get real???