My 4 year old son just got me with a dad joke I hadn't heard before

My son was playing with his teenage mutant ninja turtle action figures, and was making them fight each other.
Me: "Where are their weapons? Are they just fighting with their bare hands?"
Son: "No, they are fighting with their turtle hands."
Doesn't have a clue why I was laughing so hard.
Edit: mutant added**
Edit 2: to those who are telling me it's not a joke, because my son doesn't understand the English language. WOW, you're right! I hadn't thought of that. I really thought he got me, but you have changed everything! My 4 year old son doesn't know the word "bare", or sarcasm yet. Please stop PMing me that now. Thank you.

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