it was your connection problem or latency from your pc to sk server~ or maybe your pc not have enough power to play sk game, mind if you give me your pc spec? click start > write dxdiag in search > put here operating system, processor, memory, directX version and in display tab put here name of device you use, memory and shared memory (if exist there).
mostly this caused by bad connection but pc component can still help make game run faster
and to use sprite skill > hold button until your sprite use it skill
but don't be sad~ not only you experience this... i never use sprite skill for battle since it come -,- because it keep pointing all the time.