Skald will observe the formation for a minute or so to determine best who leads the pack... Then he will land and take on the form of a slightly smaller parasaurolophus than the leader and slowly and cautiously emerge in a non-threatening fashion. Using the knowledge he has he will graze in the direction of the herd and get close to the leader. Once there, he will communicate that there is danger ahead and to save the herd any harm, it would be best to either turn back or take a different path.
At least, that is his intention.
Spoiler: Wonder Twin Powers! Activate! Form of... A tube of toothpaste...
Using Wild Shape to take on the form and then Wild Empathy to influence the leader.