Replica Zeru performed his Iaido slash, yet Jin was able to dodge it in time since he remembered his sensei's timing by heart and the replica behaved true to its name.
At that moment he dodged, Jin performed a fall which indeed prompted Zeru to overextend his attack range, and that was when Jin initiated the Astral Form Slash after his fall. The projection of his Maqi appeared almost instantly doing a straight cut right after Zeru missed his target by a few centimetres.
Alas, it would have been too easy if that was the end of it. The replica managed to block the surprise Astral attack, but that was when Jin decided to push for a follow up strike.
However, Replica Zeru had not dismissed Jin despite the diversion of a second opponent. The replica was merely slightly confused that he had to block a sudden strike from a black and white sparkling silhouette that disappeared momentarily after that.