Snap vs Snap away
According to my dictionary, it seems that "snap away" can be optional, but I'm not sure. What is the difference between these verbs. If they are not optional, I would understand "away" as a normal preposition of being away from something.
[transitive, intransitive] (informal) to take a photograph
snap something A passing tourist snapped the incident.
snap (away) She seemed oblivious to the crowds of photographers snapping away.
PS: This is taking a quick photo, right?
Thank you in advance!