I just went off of how other cards are worded. Being from a CCG background, I read these cards very literally. And in a literal sense it says that it attacks the first two troops, which means 2 separate attacks to me.
There are other cards that distribute the damage (ie: the chainsaw) and they are worded accordingly.
But it doesn't say attack, it says "deals its damage to the first 2 troops " Never says it attacks both. So maybe you split the damage?