What kind of magic is this?

A snippet from my in-progress upmarket vampire story, The Trick

For a moment it all stopped and everything was silent. Helen listened for the tweet of a bird, the honk of traffic, or the chatter of a squirrel but heard only the sound of her own breathing. In the absence of external noise, the rhythmic beat of the pulse in her ear grew louder.

Helen marveled at the motionless tableaux. Gold and red autumn leaves were suspended in the air; a moth was caught in mid-flitter; even the feathery clouds, picking up the shine of the moon, had stopped moving. Helen touched a leaf hanging in mid-air and wondered, What kind of magic is this?