In this scenario the damaged tile flooring is grouted directly to the baseboard. As you can see in the close up on the third picture the grout is not exactly on a straight horizontal line. The grout fluctuates in height along the length of the baseboard.
When the grout is chipped away from the baseboard it will leave a footprint where the grout used to be. There will also likely be chips on the baseboard from the removal as well as tool marks.