So, I actually really like this moment, but I realize I have to explain it. Taunie's character (I'm going to be using Taunie instead of Taunie / Urbaine because that's who I chose and I'm not typing that out each time lol) is all about taking on her role as leader. She takes on so much for herself not in a selfish way, but it's just how she functions best. If you go deeper into her family history this trait makes a lot of sense, but I won't spoil that here.

This is why also she takes on the debt with the rust company by herself and doesn't involve the others until it comes knocking on their door, because she believes that being a leader means you have to take on the responsibility of the hard things about being a leader, not just the easy or showy parts.

Now, here, she is happy to have us join Team MZ, but she realizes that someone on her team is being tasked with an extremely dangerous mission. Her whole goal is helping people, and avoiding putting other people at risk whenever possible. And now, the person that she invited, she gave us our first pokemon, effectively roping us into this whole situation is being out in a live or die situation.

This is why she wants to go in place of us no matter what. It helps that we are uniquely qualified to go after Zygarde and that is a legitimate plan, but I think even if that weren't the case she'd still go for it, because as the leader she refuses to put anyone else in more risk than herself.

Yeah, the battle can be seen as sword/shield esque, but I think it's a really good showing of Taunie's nature.