Re: bowing during testing
We do not reverse.
It is strong hierarchy. Always Shomen (mostly with picture of O Sensei) first, then the tester - caution! Do not bow on being called, but only when the tester (snsei) starts bowing - he might not be prepared. And finally your partner.
The other explanation is, that the end of something is never the end, but the beginning of something else - so why reverse?