Tony moves south, and where he expects to be out of sight of the arrow shooting hobgoblins, and tries to sneak up on and around them.
Basically going 10' south and stealthing before continuing the move, to scout around - not sure how far Tony can move with this, so did not change his position in Roll20. But he will try to go 5' further south and peer around the corner.
Stealth: 1d20 + 14 ⇒ (3) + 14 = 17