Sif's blades were unsheathed the moment the cacophony crashing through the trees had a certain pattern to it. Familiar, like a lullaby one hadn't heard in far, far too long. Such was clear as crystal on the goddess's face, which now bore wide, wild eyes and a grin that favored one cheek more than the other. Especially when the beast cleared the forest, and trumpeted it's territorial intention.
Only an expectant glance in Thor's direction stayed her. Where she expected the same enthusiastic excitement for battle, there was a thoughtful calm on his face. Confused, she caught his eye with a questioning look, then tracked it beyond the two of them to Katherine, just in time to see her flick out of existence, materialize, and make her strike.
A strike that was inexperienced and off-center, but not a complete loss. Sif was still ready, and while her nerves twitched for the satisfaction of a true challenge, she delayed their gratification- for now.
"She is not used to the weight-" Sif commented in a lean toward her heavily muscled companion. "Were you not training her with the armor?"