A male and female, both wearing sandals, walking by a fence.
the man in workboots walked alone
A man in workboots is alone and contradicts a male and a female walking together, Also, the man was in sandals in one scenario and in workboots in the other.
The man is either alone or with a female.
It can either be a pair or single, The man cannot be wearing sandals and workboots at the same time.