“as” clause and tense
From “The Story of an Hour” by Kate Chopin:
“She sat with her head thrown back upon the cushion of the chair, quite motionless, except when a sob came up into her throat and shook her, as a child who had cried itself to sleep continues to sob in its dreams.”
At the ‘as’ clause, why is it fine for the verb to be conjugated in the present tense (continues), instead of past tense? I don’t believe it’s wrong, but I would like an explanation.