Moody was skilled in evasive tactics, but Rosier had caught him at a bad time. His reflexes were slow, but instinct and training kicked in along with another burst of adrenaline. So, Roiser was trying to grab his wand hand? Moody pulled back. When Roiser was distracted by his Eye and laughed, that was the opportunity Moody took to slam Roiser in the jaw with a wicked left hook.
Taking a few steps away to create more of a distance between them, Moody tried to disarm him opponent with an Expelliarmus spell. He was grinning himself - Moody couldn't give a fuck about what people thought about his appearance, least of all a Death Eater.
[OOC: Roiser has permission to wound Moody, but maybe after a few exchanges? Rosier can even get the upper hand and knock Moody off his feet - but to end the battle, maybe some monsters heard the cursing and come to see what is up, and they attack Roiser... Moody will Disapparate and leave Roiser with the monsters... what do you think?]