I know it sounds noobish, but how do you cast a spell with two keys, for example when helping Ron pack? I have tried for an hour and I cannot do it, do you hold X then Triangle at the same time, or X first then triangle?

Thanks for the help.

press X then quickly press and hold triangle

please email me the response as it wont let me login; but how do i cast reducto?? and/or where can you learn this spell?? i am stuck on the psp version and cannot find a walkthrough or help anywhere