The card reads "Exhaust this card when you place a monster as a reinforcement. Place 1 minion monster with 4 or less Health from the same monster group in an empty space adjacent to that monster, respecting group limits."

Two questions:

1.) Suppose I have such a minion that was already on the map prior to the placement of the reinforcement. Can I apply this card to it?

2.) Suppose minions of this monster group have a Health on their card of 4 or less, and I still have less than the minion group limit (on the board) if I include the reinforcement. Can I place a "new" minion on the board as described (adjacent to the reinforcement)?

Thanks!

Although I admit that the card text can be read in a different way, I think that RAI is that the card allows to reinforce two low Health monsters instead of one. The "place" in the second sentence directly refers to the "place a monster as a reinforcement" in the first sentence.

Thus, I think that 1) is not possible and 2) is RAI.