Xeth turns his lightsaber off, lest it be the escaped slave with the Jedi-killer grenades. He unholsters his sonic blaster and sets it for a low stun setting.
"This is Jedi Knight Xeth Tam of the Jedi Order, please come out! I mean no harm! Kuylen and his lackies have left this planet, thinking that they would leave you to do in the mouths of the Arthropods. You need not attack me or be afraid!"
(Also, would the grenades explode even with the lightsaber off?)