If I'm not remembering this correctly, please set me straight.
I was kind of reviewing the events of AVPR in my head today and remembered something that really bothered me specifically. After Wolf rips Chet's inner jaw out she spews acid everywhere and one of two things magically occurs:
1. None of the acid hits wolf, which is pouring out of the Predalien's mouth, mind you, even though the creatures are face to face.
2. The acid does get all over wolf, but nothing happens.
The same thing goes for Dallas shooting the Alien straight above him, but I thought the thing with Chet at the end was significantly more baffling.
It just seemed so rediculous after the scene in the beginning with the hunter's arm falling off from an acid burn after shooting a facehugger that was about three feet away.