Have one of your tribe members pick you or another person up while holding a crossbow/rifle then simple have the flyer fly over the quetzal and shoot at it till KO'ed
If your alone do the same thing except use a grappling hook and connect to your flyer of choice and whistle the flyer to attack my target while aiming at the quetzal and whistle stop all when in shooting distance of the quetzal
The fun way is to jump off and grapple to your argie and whistle it to attack and since argies are slow it won’t catch up in time so tranq till it goes out also bring parachutes and consider liking so more people will know
If you drop a quetzal due to knockout, and it lands next to a giga...just know, the quetzal belong to the giga. Now you get to watch your would be quetzal get eaten by a giga. Now you can go home and cry.