logical flaws?

Rating: Null/10 (24 August 2004)

besides all other plot holes mentioned in others' comments, here I have two questions concerning the endings:
1. alien's blood is considerably erosive, then how come that metal chain (human made) could stick into the queen's body forever while the queen was bleeding like hell from its wound?
also about the effectiveness of alien's blood, it erodes predator's armor but not the arms, funny ! given the fact that predator has much advanced technologies than human does, and they must have millions of know-how concerning the alien's characteristics, how it could be possible that they design some erosion unprotected armors but hold erosion protected weapons?
2. predators all have their masks equipped with all sorts of scan methods, then how come they carried a dead body home without any scan to see that pre-alien inside the corpse? Ignorance perhaps? given the nature of any predator, how often do you think a supreme predator would have such quality of stupidity?
after all, the plot, the directing ... all ended up very disappointing !