Temporal stasis, the ability to stop time was Pipers first power. It was initially triggered when Piper paniced and through her hands up. As the power developed, Piper learned how to only freeze certain individuals, as well as being to unfreeze frozen objects or people at will.
Molecular Combustion
As Piper grew stronger, she developed the power of molecular combustion, the ability to blow objects or demons. When she frist got this power, it was hard & emoticonal for Piper to get through. This power is channelled through her hands in the same way as her power to freeze time is. Though a powerful power, usually an instant vanquish, higher level demons such as The Source are invunerable to it.