Same as 10.2a & c covers the repeat infringements/deliberate foul play etc for a PT, law used at collapsed scrums/mauls; also covers if some deliberately throws ball out play to stop a try probably being scored. Must be the ref in me coming out LOL.
IMHO right call, advisor tells me in this type of situation, if you remove the infringing player what happens in this case take out Sivivartu and what happens try so correct call. If another defender behind Sivivartu then pen and yellow card. If that makes sense.