The impulse dulled his every other faculty.

It made him oblivious to the infinitely more important work he had laid out for himself.
No man can be forever normal when anger takes the reins.

And, for the time, Gavin Brice was deaf and blind to every motive or caution, and centered his entire faculties on the yearning to punish Milo Standish.

He had fought like a tiger and had risked his own life to save Standish from the unknown assailant's knife thrust.

Milo, in gross stupidity, had struck him senseless.