Thank you for your questions! I have updated the rules to better explain these aspects.
Below is a detailed answer.

1. The effect of "Magic Field" Says "players hit are always knocked away from the Player that cast this card. The question marks are because the knockback direction depends on where the player is. So if the attacking player is below the attacked player, the attacked player will be knocked up 1 tile.
2. One HUGE rule i forgot to add somehow, is that ALL cards can be flipped, so when you play a card, you can choose to have every box be flipped, (meaning they go right instead of left) or have all boxes not be flipped, and just be the way they are. Meaning, yes, Quick Magic can be sent left instead of right, and the knockback would also be knocking back left.
3. You miss an attack if it does not hit any player, because you only hit people i they are in the range (shown by the blue colored grid).