I'm confused by the end of Alien 3, when they drown the Xenomorph in molten lead.
- The Xenomorph manages to survive being plunged into boiling hot lead, but previous Xenomorphs were killed by and gravely scared of flamethrowers. Why?
- As the lead is poured, some shouts / screams are heard which sound like the preacher who sacrificed himself to keep the Xenomorph busy. However, he's just been covered with molten lead, so that doesn't seem likely. Who was shouting?
- The Xenomorph emerges from the lead relatively intact, then it explodes(!) after being showered with a bit of water. What caused it to explode?
Were these all just goofs / plot-holes, or are there reasonable explanations for them?