No need to apologize, you’ve already been a huge help heheh.
In that stadium section, you can actually talk to both Diego and Harry one on one. There is a way to do that.
And yes, there are some timed events in the game. Things that “disappear” if you go do something else in the meantime. The wander around option is only available there as soon as you arrive at the stadium at that point Lucas is still within reach to be saved and if you do anything else then... well... he dies... Not really but you get what I mean xD
Ahh the mini game! It’s actually not total randomness. They do adapt to what you do. For example, if you keep spamming one stance, they are supposed to adapt to it and counter it. That system is more refined for the actual fight, with actives and passives, but it’s not available yet.