Raids change channel before the raider finishes speaking
I think this happens because the viewer is say 5 seconds behind the live stream, but when the streamer starts the raid, it switches channel immediately, before their stream finishes.
The result is: The viewer doesn't hear what the original streamer says at the end of their stream. It jumps to the raid before they have finished saying goodbye!
For a smoother viewing experience, I suggest delaying the viewer's switch to the raided channel, to account for their delay, so they get to see the end of the original stream.
(This won't really affect the arrival, since raided channels don't seem to notice the raid for at least 10 seconds anyway.)