Does a user with 2k rep have the ability to change who is awarded the answer? Or is this a privilege only the OP has the ability to do?
I ask because today I had answered a question and my answer was flagged with the green checkmark and I received +15 rep. Upon returning to the site later on I noticed my total rep had dropped by 15. A user with 2k rep who answered a minute later than I, was now awarded the answer. Did the OP change their mind or did this user flag their answer as the correct one?