"Radagast!" Gandalf exclaimed in surprise, not expecting to have seen the other wizard here of all places. "It's Radagast the Brown!" he announced to the others, then quickly turned to face Radagast, a frown creasing his features. 
"What on earth are you doing here...?" it was so unusual for the reclusive wizard to leave his little clearing in the Greenwood, he preferred the company of animals to people. Something very bad must be happening to draw him out into the world.