He thought things over in his usual slow and steady way, deciding that the mention of "Mr. Brown" was not a request for an individual, but in all probability a password used by the gang.
He thought things over slowly, humming as he went to aid concentration.
mnli hypothesis: He thought things over slowly, humming as he went to aid concentration. premise: He thought things over in his usual slow and steady way, deciding that the mention of "Mr. Brown" was not a request for an individual, but in all probability a password used by the gang.