The problem is not that the pic is too small since it seems to be a bitmap/pixel font, the problem is that it has been anti-aliased so it's blurry and ugly (and almost impossible to identify for sure)
Search here
http://www.dafont.com/bitmap.php?text=tumble&fpp=50 (for those who are interested)
Another Gears of War font!
(used narrowed)
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