The episode serves to humble Sasuke. Having just faced Haku, Sasuke thought he was near elite level, but Lee shows him that brute speed and physical prowess (taijutsu) can overcome specialized techniques like the Sharingan.
is calm but focused, looking forward to testing himself against stronger opponents, particularly to measure his growth against "that man" (Itachi).
Here is a long-form write-up detailing the key events, themes, and character developments in this episode: