Well there is no tag ends its a loop you create..You bend the loop you created at 3:46 making it very slim. Then slide the it through the hook eye and push the hook through the hole. So it looks like this www.google.com/search?q=putting+hooks+on+intruder+fly&rlz=1CAWAFN_enCA831&sxsrf=ALeKk02_D1C_Dr071-Anyz7ax1KdB1REDg:1589509646214&source=lnms&tbm=isch&sa=X&ved=2ahUKEwiGi9Hu6LTpAhWtnuAKHUPFDk0Q_AUoAnoECA0QBA&biw=1242&bih=605#imgrc=C1f8FirR6LQ0JM This makes it faster and easy to change hooks. rather then actually tying a cutting and tying a knot. This helps with short striking which steelhead tend to do more often. There's also the fact that a long long shank allows the fish (if hooked say a one inch+half inside) to put more pressure on the shank with its lips to pop the hook out. This also helps keep the hook smaller for fish safety
I take it you attach the hook with the two tag ends?
Well there is no tag ends its a loop you create..You bend the loop you created at 3:46 making it very slim. Then slide the it through the hook eye and push the hook through the hole. So it looks like this www.google.com/search?q=putting+hooks+on+intruder+fly&rlz=1CAWAFN_enCA831&sxsrf=ALeKk02_D1C_Dr071-Anyz7ax1KdB1REDg:1589509646214&source=lnms&tbm=isch&sa=X&ved=2ahUKEwiGi9Hu6LTpAhWtnuAKHUPFDk0Q_AUoAnoECA0QBA&biw=1242&bih=605#imgrc=C1f8FirR6LQ0JM This makes it faster and easy to change hooks. rather then actually tying a cutting and tying a knot. This helps with short striking which steelhead tend to do more often. There's also the fact that a long long shank allows the fish (if hooked say a one inch+half inside) to put more pressure on the shank with its lips to pop the hook out. This also helps keep the hook smaller for fish safety