This is a fantastic photo. It looks an awful lot like they're standing ont top of the Lazarus Pit, but the way it's framed and with them face to face as partners? Very cool indeed. Now why are they on the pit. They're not jumping in, are they?!
Constantine is reading the writing on the floor. Normally people read the writing on the wall, but Constantine has to work with what he's got, and he gets writing on the floor a lot more often than not.