Board Thread:Ben 10 Discussion/@comment-31574541-20170324174311/@comment-5101200-20170328114957

" Waybig can defeat him and Thor don't know about his weakness on his head. And may be Thor will attack Waybug's body and not his head. Waybig will crush and destroy Thor by his strength and cosmic beams. "

Thor: *goes under Way Big, uses Way Big as a lightning rod, strikes down, lightning hits Way Big on the fin, Way Big is paralyzed*

He doesn't have to know about the weakness for him to use it. It could easily happen without him meaning to do it.