For most dinos you build a trap and lure it in.

For a Theri, that's wrong. You still build a solid structure... but it's for YOU. You don't dance with this thing trying to get it in... you build a shark cage made of window-walls to KEEP IT OUT.

I have never seen one of these murderous mofos flee very far, if at all, from torpor. They'll keep trying to slice your face off right until they keel over. Build a window-bunker nearby, cower inside while you tranq it.

You have NO IDEA how fast their torpor drops, so be prepared for that. But you'll die a lot less if you immediately turn and run for your bunker as soon as it aggro to you then shoot it from within, rather than trying to maneuver it into a trap.