Improved Arcane Missiles

From wow.incgamers.com

Talent: Improved Arcane Missiles
Effect: Gives you a % chance to avoid interruption caused by damage while channeling Arcane Missiles.
Statistics: Rank 1 = 20% Rank 2 = 40%, Rank 3 = 60%, Rank 4 = 80%, Rank 5 = 100% .