This is, I think, what we call trifling. He is cm off the pitch for 1. Something seconds and by a cm or so. He's also gone to grab a drink, and whether this is for deception or not, I am never denying a player access to water.
This is the defending teams fault, not one player looking back, keeper not looking around. Not one appeal for anything. Let's say the player didn't step off the field by an almost microscopic amount, the outcome doesn't change, because no one has seen him. The "offence", I'm not even sure it can be referred to as that, is so inconsequential, you're just looking for reasons to rule goals out and football does not want that.