some may call this play offside, depending on how you view the rule. Del Piero wasn't touched and went down.
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And if any wanted to know if Zlatan dives he has been booked for diving. It happened last season when Inter played Siena. (Replays showed there to be actual contact {which again can be diving if a play acts on the play showing that there is more contact than actually felt} if there's medium contact and you fall to the ground as if you got shot is that diving? or does diving only exist if there's no contact?) He also dove about twice in his first season at Inter.