Severus closed his eyes and inhaled deeply through his inflamed nostrils. Fuck. It was very fucking rare for Severus to be lacking on the intelligence front. In fact, he couldn't recall any mistakes in the past. It was a first, and definitely a last. He'd definitely be having words with the sources he'd received the information from when he calmed down, which would take a while. Or merely one night, if alcohol intake had anything to do with it.
He cursed loudly, banging his fist against the wall. He paused momentarily. "I'll sort this out. Let's go." He waited for no answer, cautiously pushing the back door open, putting out the light coming from the tip of his wand and glancing around for any signs of life. There was none.
Standing in the middle of the back garden, Severus raised his wand and hissed a half-hearted Morsmordre.