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He was probably flexing and thought that, considering your age you might not know anything about Bitcoin. The most interesting thing would have been if you had stopped him while he was importing the seed phrase and asked him “Are you importing the seed phrase into the wallet?” He would have been shocked right then and you would have pointed out his mistake.
Like there are CCTV cameras everywhere here and many people are watching. If someone sees your seed phrase they can take all your funds. If you had said something like that I think he would remember it for the rest of his life.
