HisSiren's "Outburst" is about swallowing anger instead of letting it out. The speaker feels rage building and admits to being helpless, caught in what they call a rollercoaster of emotions. Each time the pressure nears a breaking point, they pull it back in. The anger then sits inside, hidden behind a "well mentioned facade," a calm front that covers what's really going on.
What stands out is the speaker's mixed feelings about this. They say they love that hidden thing because it hides them so well, yet it never leaves. The outburst is always "lurking but never seen," so the tension never gets resolved. The speaker believes that lashing out would break or hurt something, and the last line admits that the one hurt is usually themselves.
The mood is tense and quietly sad. Short, plain lines make it feel like someone talking carefully, holding themselves in check. The trailing dots at the end leave a sense of tiredness and resignation.