"Petrificus totalus," Severus cast. He was tired of fighting this thing to be honest, and Locke was doing nothing but exhausting himself. The malboro froze in place, the flames from his incendio were still licking at the monster's flesh.
"Stab it, cut its tentacles off, do something," Severus grumbled. "There's a spell I could use to kill it, but I'm not certain if it will work or if it's illegal here. I'll leave the glory for you."
He was feeling weaker all the time, the drool of the malboro sapping his strength as if he were poisoned. He wasn't sure if the elixir the other man had would help or if he needed something from his own universe. If the latter, he was pretty well out of luck; he hadn't brewed since arriving in New York.