The Helmet Melting Scene

I was watching the Champions League Final on FOX yesterday and they ran a Prometheus spot. Most of the footage was familiar territory. But one thing that was different for me was the "smoking helmet/hands to the helmet" shot. This version lingered on half a second more than I'd previously seen. I rewatched it several times to see if it really was who we think it is getting burned and still couldn't tell for sure. But on the third viewing I noticed that something was going on with the lower front end of the helmet (or inside the helmet). At first I thought it was a Hammerpede coming up from inside the suit. But after going frame by frame on the DVR I couldn't be so sure. It could have been projectile vomiting by whoever was inside or a change in the helmet itself. Anyone else seen this shot and is in a better explain what I was seeing?