When you say pine floor, do you mean the traditional 3/4" thick t&g floor boards, or are you reffering to a pine effect laminate? If they are propper boards, as joiner I would carefully cut the damaged section of the wood out , splice & glue a new piece in, and then carefully sand it down with a sanding block and finally rub some matching stain into it with a cloth. In some curcumstances it would be neccessary to sand and re-finish the whole floor.
A french polisher may be able to do an invisible mend for you,