Makes senseI am guessing in order to maximize the use of the vitality surge one would use it on a complete loss of squad in the 6th round of your last province in the tournament or maybe a complete loss at the spire top? Any number crunchers out there to confirm this?
I concur @Henroo that the troops are relatively insignificant and replace them quickly also. Yet at the same time, buy just seeing the cost in diamonds to replace the troops just lost, I can judge going forward that the losses will be even greater. At some point we all say, "This is as far as I go for now." The diamond cost for me is how I judge that point.The value of the troops themself is pretty insignificant IMO. Even if a fight high in the spire or deep into the tournament goes badly, I can replace troop losses relatively quickly with a few hours of troop production from my 3 military buildings. To me the primary value of Vitality Surge is being able to replenish troops in the middle of multi-wave spire encounters. Especially if you are in a situation where you have to select troops which will be good in wave 2 and wave 3 but they are not quite as good for wave 1. So they take heavy losses right away.