Whats funny?
He knows better than to try and fight them by himself so he immediately releases Sai.

He doesn't throw the shitload of Kunai, land right next to Sai, then instead of releasing him gives some long ass speech, only to get attacked by Naruto which he of course avoids, then gets attacked by a bunch of Naruto's clones which he of course defeats then gets attacked by Yamato but avoids that attack toowhile carrying Sai, only to then be attacked by Sakura which he also avoids while carrying Sai. Only to then be attacked by giant hornets which he initially runs from then he suddenly remembers he is a ninja and proceeds to use his chakra blades to expertly dispose of the hornets which takes him a full twenty seconds but Yamato, Naruto and Sakura do not attack him during that time because they are all standing motionless. Then he thinks to himself that perhaps fighting three on one will be disadvantageous, and being attacked by hornets is a sure sign that luck is on their side. Then he suddenly remembers Sai who he was carrying the entire time.

Wordy explanation was necessary but for you visual types

Manga, read to page 7
Anime