Every live stream arrives late, and it arrives late by an amount that changes minute to minute. So the thumbnail strip you are dragging along is not showing you the same instant as the video playing above it. You mark what looks like the start of the answer and you get the last three words of the question. Then you nudge and re-cut and nudge again, and a thirty-second clip takes six minutes.
The second problem is that the moment you needed has usually gone. Live windows are short; by the time the newsdesk asks for the exchange from the top of the hour, the stream no longer holds it. ClipAI solves both by keeping its own recording of everything that came down the line, and by pinning every thumbnail to real broadcast time rather than to an estimate.