There are two things here that need to be considered:
1. Despite Padfoot's statements above, the law DOES allow for a caution to be given for this if the referee considers it unsporting enough. That's literally what unspecified USB is there for, so any referee that did stop play for this cannot be factually "wrong". And if the referee does decide it's worth a caution, he can stop play and restart with a IFK, which has the nice added benefit of stopping the player from scoring with a trick like this and causing uproar....which brings us on to point 2:
2. There's a strong match control argument for doing anything in your power to avoid letting a goal be scored via this kind of deception. Stopping play for the injury would be one way of doing this (which I think you could get away with given the player with the ball has indicated to the injured player), considering this a cautionable offence and stopping it for that is another. And a caution for the offending player might also lower the likelihood of him getting booted up in the air the next time the ball comes to him. Win-win, and totally within the law.
1. Despite Padfoot's statements above, the law DOES allow for a caution to be given for this if the referee considers it unsporting enough. That's literally what unspecified USB is there for, so any referee that did stop play for this cannot be factually "wrong". And if the referee does decide it's worth a caution, he can stop play and restart with a IFK, which has the nice added benefit of stopping the player from scoring with a trick like this and causing uproar....which brings us on to point 2:
2. There's a strong match control argument for doing anything in your power to avoid letting a goal be scored via this kind of deception. Stopping play for the injury would be one way of doing this (which I think you could get away with given the player with the ball has indicated to the injured player), considering this a cautionable offence and stopping it for that is another. And a caution for the offending player might also lower the likelihood of him getting booted up in the air the next time the ball comes to him. Win-win, and totally within the law.