"Inuyashiki" Anime w/Signs『いぬやしき』シュワでアニメ
Here is a short video of how to use sign language classifiers to convey the explosive laser beams, being released from the character's back.
Even though there are over 20 laser beams, your 5 fingers can still effectively represent the laser beams. By using classifiers following the arching bend of the laser beams, people can make the correlation between your five fingers and the laser beams.