Doesn't Havok have the ability to use the energy stored in his body and blast it out as "SOUND" waves - which are another form of energy?
If so, he can vastly widen his attack and literally vaporize Carnage.
But if not, Carnage catches him decides not to use him and chooses Havok as the next symbiote wearer. Then Carnage seeps into his poors and becomes one with the energy Havok posesses and becomes literally unstopable.