A slim, white finger was tightening on the gun trigger!

Sheila allowed about half a second for the arms to come up; when they didn't, she tightened her finger on the gun trigger.

"And what's this part that reminds me of a gun trigger?"

Her eyes had a blaze; she seemed anxious to pull the gun trigger.

He couldn't have pulled the gun trigger had he wished.

He'd found enough strength to tug the gun trigger, giving a shot as a signal.

Her forefinger gave a significant tighten on the gun trigger.

Then, before the girl's finger could snap the gun trigger.

Ah, he still has his finger on the gun trigger.

Not one even found a gun trigger, for they hadn't intended to start shooting this soon.