i am currently playing 2 player game

1) When there is only one enemy and a few other location card at the staging area , i used the engagement check and the enemy has higher threat than me. So , am i forced to fight the enemy which i wanted to avoid it or the engagement check is pass to the next player?

2) When an enemy is undefeated , after the combat phrase , do we discard the shadow card or it stay with the undefeated enemy?

3) i am blocking an enemy attack , the creature reveal its shadow card, there is a shadow effect , So , can the other player use its event card such as hasty stroke to remove the shadow effect on that shadow card when i am currently trying to block the enemy attack??

Thanks for the answer!!!!