Step 1) Grab a Trapper
Step 2) Grab your netgun
Step 3) Let the Ptera charge right at you
Step 4) Wait till the Ptera fills your recticle/crosshair *however you wanna call it for this weapon* - SHOOT
Step 5) If the Ptera slides away cause of its speed or doesnt reach you at your feet walk towards it ** becareful for other dino's**
Step 6) While still wielding the Netgun, Right click your mouse while aiming at the Trapped Ptera.

Attempted 3 times myself after Ive tested it on a RP server with a non moving ptera.
Succes: 3 / 3 ** 3 different opponents**

Keywords: Trapper, Netgun, Timing ((no pun intended but TNT))