I left out the part about the Nevermore fans chucking random people on the edges of the pit into the pit, despite the fact that they really didn't want to be in it.
I got hit in the face by a Nevermore fan flying out of the pit. About knocked me on my ass too, and I'm 6'02" and nearly 200 pounds... Luckily some guy next to me threw him off of me while I regained my balance.
Yeah, people moshed pretty much to any part of any song that was heavy.
It's very easy to handbang during Opeth songs like Deliverance, The Leper Affinity, Baying of the Hounds, Ghost of Perdition, The Grand Conjuration, Demon of the Fall, and Master's Apprentices. Anything that is insanely heavy (be it fast or slow) will do.