Batman vs TMNT: Shredder's arrival in Gotham caught our PG-13 expectations off guard

Shredder's scene in Gotham in Batman vs TMNT turned out darker than we expected. The PG-13 rating had us assuming that nobody would die and there would be no blood.

Shredder's kill breaks the PG-13 expectation

The scene opens with confusion over the question "Where are your meta-humans?" and whether it means the turtles. Then Shredder cuts a man's throat. Our reaction was plain shock: "I saw PG-13, I thought nobody was dying, no blood. They just killed that guy."

Shredder takes on Batman

Shredder makes no attempt to get away. He comes down to face Batman, who asks him "Who are you? And why are you in Gotham?" We imagined his answer: he fights real mutant turtles, so a human bat is not much of a threat. We called the fight itself gnarly, with Shredder "giving Batman the business," and we imagined Batman thinking, "All right, I'm going to have to take this dude serious."