"Sure, why not. Uh, angels, demons, and fairies are all summonable beings; you draw the correct sort of diagram on the floor - please don't do that yourself again, a lot of demons only answer summons because they like being jerks to humans, some angels and fairies are dangerous too - and the words in the diagram can limit the summons's behavior, and then you negotiate further out loud, which is easy to screw up if your summon is hostile. I don't expect these angels to be hostile but just on general principle. Since you're the summoner, if you don't say anything, it is impossible to screw up the negotiation step; you can just confirm what I work out with them, or dismiss them - by concentrating on wanting them gone for a minute - if they would prefer to go home. Uh, I'm not actually positive any of this will work. Something very unusual is going on because to my knowledge no one has ever been summoned to this planet before and there's another one where we get summonses all the time. But the angel I have picked out for the first try is - I'm not thrilled to be risking stranding them but I'd be less thrilled to let your planet be Ice Aged to death."