Curses order of play

[wes85]

Specifically in Harry Potter Munchkin. If someone draws a monster that has a "when it enters combat statement" can you play a curse such as "lose your turn" to avoid suffering the bad stuff of that monster.

For example

When it enters combat, lose an ally. Can I play a curse that ends my turn to avoid suffering the when it enters combat effect to avoid losing an ally.

Also,

When it enters combat, roll a die, lose half that number of items rounded up.
Rolled a die that requires the loss of two items. Then the curse lose a hand item was played before I chose my items. Do I lose the hand item immediately or do I lose the two items from when the card entered combat allowing me to chose a two hand items as the items lost effectively ruining the use of that specific curse card.