Well, yeah. His personality and temperament was clearly made to paint him as wrong because he didn't trust Banagher at all and absolutely didn't believe Loni could be redeemed. I just think that his actions, shooting a rampaging mobile armor when his ally wouldn't, isn't technically the wrong decision to make. Just the motivations are wrong.
For the scene itself, it's clearly meant to be "he didn't want to believe that she had stopped". But because they made it so he shoots immediately after being shot at, it sometimes makes me think "he probably didn't realize she had already stopped". Obviously wrong, but backed up by the fact that he actually did not attack when she had stopped fighting literally a few minutes before.
Basically, I'm just overthinking easily-interpreted scenes.