When he called out to me, I turned around to look at him and nearly fell. He chuckled to himself as he scanned over my body and told me to"be careful?

We were talking previously, and I didn't realise he was behind me since he wanted to continue the conversation. I was shocked when he called my name, and when I turned around, I lost my equilibrium but did not fall. I blushed and felt humiliated because he chuckled to himself while scanning my body and saying, "Be careful." What does this mean?

When he called out to me, I turned around to look at him and nearly fell. He chuckled to himself as he scanned over my body and told me to"be careful?
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