Fenrir heard the sounds of someone approaching inside the house and he took a few steps back to give himself some room. When the door opened, he snarled and launched himself forward. The screen door shattered under his weight but the back door itself held steady. That wasn't that much of a surprise to Fenrir. He hadn't had his usual run up so it would take more than one blow to get it open.
He snarled at Natasha and gestured towards the nearby windows with a jerk of his head then he leapt at the door once again. It shuddered and creaked alarmingly under his attack and on his third leap, it cracked and he was able to force his way through.