Collision Detection If one of your team members is replying to a message, assigning it as a Case, or marked it complete, Sprout Social displays a notification in real time so you can avoid sending duplicate or conflicting responses to the same message. This is called Collision Detection. If you click to reply at the same time another team member does, Sprout will also show you the Collision Detection notification within the reply modal as well as in Drafts. Once any message has a response, the reply icon on the message becomes shaded. Hover over the reply icon to see which team member sent the reply to the message.