Thanks for the explanations. So a TR can be taken in Heat 14 (I can see quite a few of these happening). One thing that you ( or most probably the rules) don't mention is can both riders in one heat be nominated as TRs, giving a 10-1 heat win if they come first and second?
If so, it would allow a team dropping eight points behind after heat 13 to try this. A first and second would give them a one point lead going into heat 15 instead of a four point deficit.