[GAMEPLAY] Nunu's W casts in a wrong direction (Bugs)

Nunu W is known to have many bugs. The common one is that it casts W-SnowBall toward a different direction rather than to the cursor. The reason(s) had been a mystery, but now I just found 1 way to cause the bug 100% of the time.

1. stand (or walk) next to an obstacle(a tree)
2. move your cursor in the direction of the obstacle
3. cast W Result: The SnowBall will start toward a different direction in order to curve around the obstacle rather than hitting onto it. Please watch the video.

There may be other reasons to cause a similar bug because it happens too often.

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Another bug of Nunu's W is that when you recast W to release the SnowBall, the SnowBall spawn at a different location [display problem]. Similar to Yuumi Q bugs fixed in 9.12.