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Hey, there’s only two things I do well, sweetheart, and skating’s the other one.
— Doug · The Cutting Edge

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
Doug boasts that he's only good at two things, and skating happens to be the other one. The joke leaves the first skill unnamed, letting innuendo fill the gap. It reads as a confident, flirtatious brag built entirely on suggestion.
Context reviewed