Romantic chicken and a return to the series' roots of being the Death Note of being trans and gay.
As far as this specific bout goes, competitive spirit and a pretext for seduction/flirting seems to be the main thing as far as Tachibana is concerned.
Jinguuji coughing up blood from his own attempts at flirting on page 1 is the same energy as a Pokemon injuring itself by trying to attack while Confused.