Ive just had a quick look through the forum here and couldnt find anything on this, but I was wondering if it is possible to utilise 430EXII as a slave, triggered via a 630EXRT, which in turn is being triggered via a Canon ST-E3-RT?

Ive tried it out myself and cant seem to get the 430EXII to fire although I have not spent too much time troubleshooting as yet.

Any tips or suggestions?