If you put wild battle in a middle of the event, the event doesn't play out properly.
As shown in the image above. I put the conditional branch of different event outcomes whether the player wins or loses. However, the event will just stop playing altogether right after the battle ends instead of going either to the outcome of whether you won or lost. That's because the events went through the whole event before the battle was even over.
Here's a video demonstrating what I mean.
https://youtu.be/Yab5XHEdtV0 (the event just immediately ends after the wild battle).