After various exploits unite them, Yen teaches the boys the five-tigers-become-one style from a book she's been carrying. This unique fighting style will allow the brothers to pool their attributes and become an invincible fighting unit -- as they'll have to be to defeat the Flying Dragons' master, the man who killed their father.
Observing the style in practice just might inspire doubt in general audiences.
For all that Master Lung (Tien Fung) is a villainous bastard, I couldn't help urging him to go for the legs during the climactic battle. But I suppose that you have to accept the premise that the legs of Blacksmith Gao, who forms the base of the formation, are so strong that Lung could not hope to topple him and his brothers. Wuxia stories often require such leaps of faith, but since we're dealing with fantasy movies it's not exactly an insult to the intelligence to indulge Brothers Five in its whimsies. The show is so lighthearted overall, so akin in its high spirits to the old Hollywood swashbucklers, that you can't hold anything against it. But you can definitely admire the dynamic exuberance of Lo Wei's direction and the infectious good nature of the six protagonists. Cheng Pei-pei naturally steps aside often to let the brothers do their stuff, but her authority is never in doubt, and when she tells Lung that she won't interfere in the climactic fight, you can't help feeling that she could deal with the villain quite nicely on her own, Lady Hermit style.
Lo Wei often keeps his frame busy by having stuntmen circle a hero or heroine, as seen from inside the circle with Cheng Pei-pei (above) or from a bird's-eye view (below).
If you're looking for intense emotions, virtuoso fighting or extreme violence, Brothers Five may not satisfy, but if you can have fun watching charismatic people beat each other up in a fantastic setting, you can have a lot of fun with this picture. Films like these may have played in American grindhouses, but they really kept the spirit of the old Saturday matinees alive.