Not bad guide.
Trapping the animals is just for them to not run away when you attack.
So they'll leave combat, but can't go away, and then you are free to go kill them in contact.
You don't need to reset attack of the animals.
Look when they can't approach you, every 10 seconds (it depends of intensity though, it could be 3 seconds...), they will "move" it's a very fast move, and it does nothing, they just move a bit. It's like they wanted to attack you at this moment, they saw they couldn't so they are not moving more...
So it's the moment to go fast to contact to do something.
For example with deers :
Pull one on some of the spot showed on first post.
Then go away, loose aggro (and get some branches).
Come back, and close the spot, so he can't run away.
Get into water where he can't touch you.
Then engage : get some IP (Call down the thunder is a must have, but even with dash you can do it, for dash, wait for him to "mini-move" and dash just after that so he won't hit you)
When 26+ IP, wait for mini-move and "opportunity knock" him. Do this again, and again, until he has no defense. (blue tray empty)
Then hit him the stronger you can ('Knock this teeth out' for example).
It will deal very high damage, so the deer will leave combat (look at the top right icon to be sure), but he can't go away, he's trapped
So he'll just heal up.
Then you can go close to him without any fear of being attacked. Just stick to him so you can do your moves the faster.
Then "flex"/"jump" (2-3 times) then attack with punch or knock if you have enough IP.
One or two times should be enough to kill it.
Ah obviously, pull the deer far away from his mates, so they won't heal him up...