goof - continuity (spoiler)

Rating: 8/10 (13 January 2010)

splendid movie, I saw just 1 continuity goof:
Jake Sully's Avatar cannot defend himself to the Thanator when he enters the jungle for the first time. At the end the AMP suit of Colonel Quaritch beats the Thanator easily. After that Jake Sully's Avatar defends himself with a knife to the attacks of the arms of the AMP suit.
In other words: The Thanator is stronger than the Avatar. The AMP suit is stronger than the Thanator. The Avatar is stronger than the AMP suit.
When you think about the physical forces working in these acts and movements, and imagining the body weights of the subjects, the Avatars successful defense to the AMP suit seems not logical to me at all.