A question about a recipe: Squid and Celery Stir Fry

I have a question about step 1 on the recipe "Squid and Celery Stir Fry" from yuko. It says:

"With a kitchen scissor or a knife, cut one side of the squid to open it. With the tip of a very sharp knife, score the squid diagonally (1/16" - 1/8" intervals). Do not cut all the way through. Turn the squid 90 degrees and score the squid diagonally again to make a criss-cross pattern. Cut the squid into bite size pieces and spread on a colander. Place the colander in the sink."