Rpg Maker Developers Group

Hi! I have been toying with RPGM MV for the last 10 days or so. I have watched some tutorials, and I think I understand the basics. Of course I have a long way to go still, so that's why I'm just messing arround with the program, trying to implement the ideas I have. What I have created:

An intro(It's just for practice, I don't think it's any good). For the most part it looks as I imagined it, and although I think I have made the eventing unnecessarily complicated, it mostly works as intended. A couple of issues I have: the flash screen is used to change the background while keeping the characters in place, but I can't make it look good, it looks out of place. also, I don't know how to make the image of the monster dissapear after I press Enter to go on with the text.

A battle test. Here the hero can interact with the NPC to battle against different enemies. I used a "Show Choices" command. If you select "Choose opponent", you can battle against Slimes, Orc or Minotaurus. Once you select that, the Battle switch will turn on and make the respective monster appear as an event on the left side of the NPC. If you interact with it, you battle. Also I have added a conditional branch to check if the Battle switch is on. If that's the case, you won't be a ble to summon another monster. After the battle, the result will be stored in a variable(1 for each enemy) and you will be able to check your record by selecting "Battle Record". My problem is that I can only make this event work once. After I finish a battle the enemy sprite will not dissapear, and If I choose another enemy, nothing happens(I can still battle the one that's there) and the conditional branch tells me that there is already a monster to battle.

I hope my explanations are clear. Here is a link to my test project. Once you have watched the intro, you will be outside to try the battle test.
Hope you can help me and thanks!

EDIT: Here there are the screenshots of the battle event thingy: