"You needn't be afraid," he says, "I'll try."

Lancelot does have a treat for Szarka, and he steps over to hand it to her, saying, "Good girl. Wait a moment."

Then he turns back to the tree and starts up, carefully; he is fairly certain the tree won't bear up well, but all he's really trying to do is get close enough to Galahad to allow him to scramble down.