The bucket of confetti is a warning to the breach team that they are expected. They do not have the element of surprise and the trap-setter has prepared.

If they proceed, further traps may be more lethal, and the breach team will have only themselves to blame.

This is why we should reintroduce knock-and-talk, so that law enforcement can re-establish their relationship with the public as a mutualist one.

That, or abolish the police for other approaches.