As his teacher explained the next technique, Trunks allows a smirk to come across his face. Numerous times he had heard those words in his five elemental trainings, yet because he didn't know the technique, he couldn't access any of them. The shadow clone technique is the piece he needs to say he's truly mastered all of them. Trunks suppresses these thoughts and focuses on the tasks at hand, listening carefully to the description of the next technique as well.
After he is finished speaking, Trunks readies himself to demonstrate his understanding. Facing the same dummy as before, Trunks envisions all of himself; down to his chakra systems, natural physiology, and minute details of appearance. Concentrating all of the chakra that he can muster, Trunks forms the cross-fingered hand sign and creates two identical clones of himself that appear in a whisper of smoke standing to either side of him.
Trunks is momentarily taken back at the amount of chakra that he is left with. Never in mission or battle had he been left with this little. Trunks and the clones then simultaneously repeat the process of hand seals that his teacher had performed before, followed by throwing several kunai at the dummy. The kunai would travel a short distance before being multiplied into a barrage of kunai, covering a wide range. As the kunai begin to hit the dummy, it is immediately ripped to shreds, with all of the others being completely overkill.
Gaining a full understanding of the techniques limitations and dangers, the smile slips from Trunks' face. I don't suppose the unused chakra is returned after I disperse these clones, huh?