Oh no. I've been shadowing a problem call hours in I noticed they had accidentally clicked in a Cmd window, which pauses it. They had been waiting on a paused screen for hours.
@SwiftOnSecurity which reminded me that on the Amiga, holding the right mouse button would block display updates, so that became a super way to pause console window scrolling. (That had to do with how the UI preserved the pixels behind the pull down menus — those pixels had to not change)