Invelion doesn't know Rappai's views on the T Rex's importance in the balance of nature. He sees it as a threat to himself, his friends, and the natives. He believes putting an end to the threat of the T Rex will be for the good of all, and will be appreciated by the dwarves as well, perhaps giving him a boost on his diplomacy with them. He hopes to make friends, and possibly learn more about the spring they are going to. As to getting healing, he hopes that by flying he'll be out of harm's way, and will delay getting healing to pursue the T Rex. His plan is to pursue it from the air, and blast it with fireballs from a good distance. He will communicate the same to Mourn, hoping Mourn will help bring an end to the threat of the T Rex.