I'd try tickling the trigger. LIke what Greg said but pull the trigger and release and maybe pull it again.
After many many take downs I still get the brick wall from time to time. Tickle the trigger and she'll come off.
I doubt there's anything wrong just a learning curve. But again, you do what your comfortable doing.
In Memory of Paul "Dietrich" Stines.
Dad: Say something nice to your cousin Shirley
Dietrich: For a fat girl you sure don't sweat much.
Cue sound of Head slap.
RIP Muggsy & TMan
"If you are a warrior legally authorized to carry a weapon and you step outside without that weapon, then you become a sheep, pretending that JOCKO will not come today."