Boruto: Naruto Next Generations Episode 221 - M2F transformation
 

During the chunin exams When Sarada Running back to the entrance of the forest of death she sees Mitsuki carrying his rescue ninja back. When Sarada asks mitsuki how boruto is doing mitsuki says he doesn’t care about boruto. That’s when Sarada figures out that mitsuki is imposter. Turns out it was Mirai Sarutobi who was using the transformation jitsu to fool Sarada. M2F transformation at 17:12 mark. A poof smoke transformation as usual.