Ok folks if you come up on a chest being worked on, please let that person alone. Don't wait for them to fail and immediately take over and basicly steal the chest.
Let them walk away, they got to the chest first, don't be rude.
This happened to me yesterday on a Master chest, missed my first attempt by a tick, with a player just waiting for the steal and sure enough they stole it. I asked them to stop, then reported them.
I know there are those of you that will see this on the side of the thief which is fine, everyone has an opinion.