Just before Rong was done fusing Yang and Nguyen into an evil clone of Ngee, Nguyen dashes to escape the fusion. She was going to save Yang as well, but it was too late! Thankfully, Yang revived later. (Proof: https://scratch.mit.edu/projects/545290724/)
Credit to @NooalfFan35, @Pszczolka_Erina, and @HarryCreator3000.
