Guy opens the Seventh Gate to counter Kisame Hoshigaki's "Great Shark Bullet Technique". While Kisame's attack is designed to absorb chakra and grow stronger, Guy's Daytime Tiger is pure air pressure (physical force), rendering Kisame's absorption ability useless.
The beginning of the episode concludes the emotional meeting between Naruto and his mother, Kushina, as her chakra finally fades away.
Fans have noted that several techniques in this episode, particularly the battle sequences involving Kisame's sharks, differ significantly from their depiction in the original manga.
Watch the intense battle between Might Guy and Kisame, featuring the opening of the 7th Gate: