TMR put this up on their Facebook asking who has to give way, but that's too easy. A much more complicated question is: what does the law say around indicating?
I've seen people say only blue must indicate, others say both must indicate, and yet others say neither must indicate. Which is correct?
@Zagorath
Only blue indicates, because they are the only one making a physical lateral movement with respect to their lane. The bike keeps straight with respect to their lane so no need to indicate.