How do you exstend sonics arms on sonic unleshed

this is a move that you can only use as the werehog (night levels) to extend the arms, press and hold either b,y or x (xbox version) or sqaure, triangle or circle (ps3 version) b(circle) will allow you to grab enemies, or ledges (when it comes to ledges, i find holding the grab button helps) y(triangle) and x(sqaure) will allow puches and kicks, the more you level up, the more times sonic will extens his arms to hit the enemies. even if you are doing this on the wii or ps2 versions, sonic shouls extens automatically.