As TV Tropes quotes:
"You're being chased. Quickly, you run inside a building and close the door. But how do you keep the door closed with such a wimpy lock? Haphazardly nail random boards across the doorway!
This is a common trope in animation. Because of Hammerspace, the character can get the needed hammer in an instant, plus a pile of boards and nails. The boards will always crisscross and overlap, as if the character doesn't have time to be precise with their work due to the dire nature of the threat on the other side. Often the boards are placed in ways that would make them bulge out and very hard to nail down. In Real Life, this is a semi-realistic trope - boarding up a door is a fairly good way to barricade it, and if you have some people to hold the door closed as you do it, then it can make a reasonably speedy improvised weapon. Variations have been used in several medieval and early modern sieges."

No hammers in this forcing the machine to the door to barricade the only way in. Whats Blastoise scared of being caught by...? Shrug.