Question Was "that jutsu" ever confirmed?

[Azuma]

I was reading through some older chapters when I stumbled upon a panel of Jiraiya telling Naruto not to use "that jutsu". This was at the beginning of the 'Save Gaara Arc'. It bugged me that I couldn't remember what jutsu Jiraiya was referring to so I thought I'd post it as a question here so I can get it out of my mind.

Thanks in advance,

 

[LnDRash]

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