Haley looked surprised at first but then followed in tow, sprinting up the stairs, halfway up she however she misjudged and hung her foot, stumbled forward, and collapsed to the stairs, the drill flew from her hand and clattered against the step in front of her.

The door was just a few steps in front of Hazel, and Haley lay several stairs down, scrambling, trying to get up.

A shadowy silhouette could be seen, seemingly to have appeared out of nowhere, it stood at the bottom of the staircase.
It was tall and lean looking, a low rumbling growl like that of wolf could be heard.
Haley tried to stand and dash but hung her foot and fell again.
The growling turned into a loud and vicious snarl, as the shadow figure game walking in an elegant fashion up the stairs, slowly and  purposely closing in on the downed Haley.