Jedda's the guy who shouts "phasers down!" and then gets zapped by Terrell.
In the original version of the Kirk/David fight, when Carol shocks everyone be revealing that Kirk and David are father and son--Terrell snatches the Phaser from 'Jedda' while his is distracted.
It's not explained in the final cut where Terrell gets that phaser. Presumably Chekov picks up the phaser that David knocked from Kirk's hand at the beginning of the scuffle.