I did end up using a different approach for this, however. The main drawback with this approach is that while it is good for bullets colliding with sprites, it does not work well with sprites that rely on Flixel collision to control placement. This works with bullets typically because they will simply get removed from the display (or recycled using whatever mechanism), but when doing collisions that expect Flixel to manage the positions of the two sprites, Flixel will resolve positions based on the sprite’s bounding boxes, and not the actual pixels.

I worked around this by integrating the excellent Box2D Flash library and tying b2d bodies to sprites. Turns out that this integration works quite well, and it was the technique I ended up using in Don’t Get Shot.
http://www.kongregate.com/games/OurNewGame/dont-get-shot-issue-1

I couldn’t find the FlxCore class, and when I tried to override the hitFloor, it said : “Error: Method marked override must override another method.”

Any idea on how to solve this?

Thx