Dallas is listening to Mozart's "Eine Kleine Nachtmusik" when Ash calls him to look at Kane. Dallas calls Ripley to meet him there, too.
In the infirmary, the facehugger is no longer on Kane's face. The crew searches the infirmary for it. Ever with the cinematic timing, the facehugger falls onto Ripley for a classic jump scare before everyone realizes it's dead.
Ripley wants to get rid of it, but Ash protests that it needs to go back with them for testing. Dallas says that it is Ash's decision as he's the science officer.