It would be ridiculous if he was given this length of ban.
I noticed it at the time, he had Pryce's upper body, I would argue he didn't actually have hold of his head or neck. He had Pryce in front of him with Pryce's back to him and was trying to put him on the ground on his back, Pryce obviously trying to resist and go down face first. From what I can remember it was actually Mose Masoe lending weight as second man in during the wrestling stage that caused Pryce's neck to bend forwards, pushing his head into his chest as LMS was pushed over the back of him. Totally accidental on LMS' part.
I support the RFL pulling this up, but can't help but be annoyed by the complete lack of consistency. LMS could cop a 3 match ban for accidentally hurting a player, yet Flower for example tries to destroy a player's knee with an horrendous cannonball tackle and that's okay because the joint bends that way (We'll ignore the impact on the knee and back when 40 stone is sent crashing on top of the joint as the body goes backwards and lower leg forwards eh?).