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Except, there is nothing wrong with it.
If you overextend your infantry, you will loose it.
Retreat was never supposed to be free "out of fail" card where angels descend upon your troops and with that divine intervention allow them to come out unharmed from the avalanche of bullets and flames.
Retreat makes your squads harder to kill for small arms and thats about it. If you've lost squad to anything else on retreat, it means you overextended or were successfully flanked.
ROFLMAO But I want my Angels!
If you did this OP the counter to the effectivness of the KV8 would be simply hitting the retreat button. Then this expensive call in would be useless really. Unless of course they countered it by BUFFING the flame damage to insta whipe levels like it was in the past and I dont think ANYONE wants that. Like SURPRISE KV8 *entire army gone*