The strange ending of the Little Red Lopez vs. Fel Clemente fight

Everything is odd about this fight. An American vs. a Filipino in Italy, which only happened due to Clemente being a late substitute. Clemente takes an early lead against the notoriously slow starting Lopez, but then Lopez battles back...and suddenly Lopez is bleeding a lot. The fight is stopped in the 4th and instead of going to the cards, or declaring it a technical draw, Clemente is DQed for a headbutt leaving everyone confused. I'm no rules expert at all. So what should the official ruling have been? Go to the cards? Technical draw? Could Clemente actually be DQed even though he was not warned or anything when the headbutt actually happened?

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