Caranthir allows for a 1 power copy of a card, so he used it on imlerith. The only problem being Imlerith should then be on the same row as caranthir. because the ranged row has imlerith with a shield and 4 power, so eredin buff. The only other way to get a 5 strength imlerith from a caranthir copy would be something like the whispering hillock.
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Only other thing is if he cloned imlerith before, and then resurrected him, that would put him at 5 strength but it doesn't look like he did that either so idk. caranthir couldnt be used on yenn because she is at full strength. Or if he cloned imlerith on the first row, the ale would have boosted him by 4, giving him full power again. that seems to be it. So not a cheater.