Chris Pratt’s sci-fi thriller “ Mercy ” has collected $11.2 million in its North American debut, enough to end the five-weekend reign of James Cameron’s behemoth “ Avatar: Fire and Ash .” Though not a blockbuster result for “Mercy,” it’s an impressive tally considering the massive winter storm that’s currently blanketing a large portion of the U.S. with snow. Warnings of frigid temperatures, high winds and blizzards have been issued across 37 states, from Texas to Maine, resulting in major