Like many mutant siblings, Scott and his brother Alex have proven to be immune to each other's powers. In fact, in some cases exposure to Cyclops's optic blasts actually makes Havok stronger as he absorbs the energy and uses it himself. Thus, whenever the pair fight they tend to resort to physical confrontations, as neither has ever been able to use his powers to harm the other. Unusually, the same isn't true for their third brother, Vulcan. Because Vulcan is both the youngest and most powerful of the brothers, he is immune to both Cyclops's and Havok's powers. However, Cyclops isn't immune to his younger brother Vulcan's abilities, although Havok remains immune to Cyclops's and resistant to Vulcan's.
With a (nearly) useless degree in English literature and a personal trainer qualification he's never used, Freddie spends his times writing things that he hopes will somehow pay the rent. He's also a former professional singer, and plays the saxophone and ukulele. He's not really used to talking about himself in the third person, and would like to stop now, thanks.