Okay, so headshot might be too strong a word here, but Modern Warfare 2 has certainly wounded Xbox Live Arcade activity, as GamerBytes reports that top Arcade titles have seen a massive reduction in leaderboard activity since the release of Infinity Ward's latest blockbuster. Specifically, Trials HD -- long the reigning XBLA champion -- saw it's leaderboard numbers drop from 14,890 players on the week of November 2 to 8,942 the week of November 9, about a 40 percent loss. Meanwhile, other titles including South Park, Zombie Apocalypse and Tower Bloxx Deluxe saw their leaderboards almost halved. Castle Crashers, curiously, only saw its numbers drop from 8,395 players to 6,034, a reduction of only 28 percent. Still, it's pretty clear that Modern Warfare 2 has pulled a lot of gamers away from the more casual fare on XBLA. Either that, or lots of hardcore Call of Duty fans unceremoniously yanked the controllers from their more casually-oriented significant others.