Rep Zephyr is clearly angry because they wouldn't allow her to speak. It wasn't the outcome of the vote that prompted her anger as you suggested, she was angry before the vote took place.
When I rose up and said there is blood on your hands, I was not being hyperbolic. I was speaking to the real consequences of the votes that we as legislators take in this body... And when the speaker asks me to apologize on behalf of decorum, what he is really asking me to do is be silent when my community is facing bills that get us killed. He’s asking me to be complicit in this legislature’s eradication of our community, and I refuse to do so and I will always refuse to do so...
When I stood up to speak on Senate Bill 99, I chose my words with precision, and I spoke with clarity because I see the real harm that these bills bring. I won’t be apologizing for my remarks...
This was a bill that was one of many targeting the LGBTQ community in Montana. This legislature has systematically attacked that community. We have seen bills targeting our art forms, our books, our history and our health care... And I rose up in defense of my community that day, speaking to harms that these bills bring and that I have first-hand experience knowing about. I have friends that have taken their lives because of these bills...
If you use decorum to silence people who hold you accountable, then all you're doing is using decorum as a tool of oppression... We’re also in a moment right now with those in power in the Republican Party don’t want to be held accountable, so whether it is my transness here in Montana rising up in defense of my community, other cisgender women rising up in defense of the trans community in Nebraska or people in Tennessee, representatives in Tennessee rising up about gun violence. It’s really about the marginalized being silenced by those in power who don’t want to be held accountable.” -- Rep. Zooey Zephyr