When 1 player accesses a Trapped Chest and goes AFK, and the other player pushes the AFK player away from that chest (Water), the AFK player will still have access to the chest (e.g can edit items inside) but the redstone signal will stop emitting and the chest will be closed for other people.
Could be used to overcome traps set up by players.
Environment
LAN Server
Tested with Offline account 'Player' and a bought account.
13w04a
—
Windows 8, 32bit 64bit processor
Unable to reproduce