I think it plays out like this -
Fifield, Milburn and Holloway rouse the Snakehugger from the black oily depths.
Milburn being the curious botanist, gets closer to it. Fifield is paranoid and scared to go near it. Holloway is a douche jock and reaches out to touch it. Snakehugger grabs onto his wrist and starts to slowly coil itself around his lower arm. Holloway is, at first, fascinated. He then tries to shake it loose. It won't budge. He then grabs at it. It gets tighter and tighter. He shouts for Fifield to try and prize it loose. He won't go anywhere near it. Milburn tries to help, but the creature gets tighter and tighter to the point where Holloway's arm breaks. Now its serious. Fifield has no choice but to help. He removes a knife from his belt and cuts the creature, acid blood spurts from the wound onto his helmet. Fifield stumbles back. Milburn panics. The creature, realising it is under attack, quickly reveals its head and, like a cobra, spits a huge glob of acid directly onto Milburn's helmet, which causes the glass to dissolve into his face. The Snakehugger then writhes its way into Holloway's suit and burrows itself into his skin...