The toad style is immensely strong and immune to nearly any weapon. When it's properly used, it's almost invincible.

11 seconds sound clip from the Five Deadly Venoms movie soundboard.

You can hear this line at 00:06:11 in the Blu-ray version of the movie.

Quote context

[...]

- After number three left, I took up pupils number four and five.

- Number four in fact was older than number two and three.

- He practiced the lizard style. The lizard is a very agile and nimble style, particularly effective in climbing. When mastered properly, it enables a man to climb like a lizard.

- The fifth pupil, he practiced the toad style.

- Four and five knew each other, but never met the other three.

- The toad style is immensely strong and immune to nearly any weapon. When it's properly used, it's almost invincible.

- It can even bend solid metal.

- You've not specialized in any one skill because I chose to teach you all of my main techniques as there was little time.

- So then compared with the other pupils, you don't stand up, you're not really their match.

- I taught all I could, but time's run out.

[...]