You turn but don't see anything. There is a definite breathing sound, coming from somewhere in the room but you don't know where. Then the room begins to grow darker. You look at your watch but the time shows 3pm. That's when you remember that there was supposed to be a solar eclipse from 3 to 3:02 today.
The sky grows completely dark as a beast launches itself at you. You figure out where the beast was coming from, just in time to let yourself fall down with the beast before using his own momentum to carry him into the opposite wall. You look at your right shoulder. It's bleeding and you figure that the beast must have gotten it on the way down.
You scramble for the stairs, trying to get out of there before it could recover. You reach the base of the stairs when it grabs your foot, its long claws stabbing into your heel.