What internal durability feats has Thor shown. If Sue is in a bloodlusted state she will go for instant kill and unless if Thor's internal organs are extremely durable, Sue would kill him almost immediately.
He tanked several punches from the Hulk, who destroyed a Chitauri whale in one hit... His organs, skin, tissue, muscles and bones are extremely durable.
@BlueLantern1995: But Thor does show durability for inside organs. In physical battles he gets hit and smashed around constantly. If he only had a tough exterior, he'd be dead by now due to his insides and his brain not being able to withstand any form of shock higher than a humans. And human organs can't withstand much shock at all. He'd be like a driver during a car crash.