Foggy knows Matt is Daredevil, sure. He's seen the bruised and bloody aftermath of his friend's nightly jaunts, but he's never actually seen (besides some grainy news footage) Matt fight.
Something happens, maybe some thugs think that this blind guy and his friend are an easy target, and Matt unleashes hell.
Cue Foggy trying to reconcile the fact that Matt just broke some guy's arm like it was nothing, and what that the whole entire "Got the Devil in me" thing means.
Cue Matt sensing that his best friend is more scared of him than of the guys who just jumped them. And that knowing that hurts so much than any injury ever has.
[Gen] Matt, Foggy: Meeting the Devil
Something happens, maybe some thugs think that this blind guy and his friend are an easy target, and Matt unleashes hell.
Cue Foggy trying to reconcile the fact that Matt just broke some guy's arm like it was nothing, and what that the whole entire "Got the Devil in me" thing means.
Cue Matt sensing that his best friend is more scared of him than of the guys who just jumped them. And that knowing that hurts so much than any injury ever has.