We have some time to try to find the wolf ourselves. If we don't, I can talk to the Grounders. Tell them there's a dangerous animal and that they need my help to defend themselves against it. Maybe they'll even have an idea of where it is, or where the survivors are-- if there's more than one. There probably isn't, but any survivor from that village is probably the wolf, or will be one themselves if they were bitten during the attack.
And when I say I'll talk to them, I mean I'll make them listen. With magic. I can be very persuasive when I need to be.