Grath moves to L13 (6 squares, his full movement). It is unclear (to me) if this is the surprise round or a free turn of action before surprise round. If it is the surprise round and Grath gets a partial action he stops at L13.

If he gets a full round of actions
Spoiler
Show
he shoots his bow at the maroon in square R-8.

to hit: (1d20+2)[11]
damage: (1d6)[4]

If necessary, to confirm critical: (1d20+2)[17]
critical damage(2d6)[6]


If not he prepares to charge, dropping his shortbow on the ground and drawing the greataxe as he moves.

Initiative: (1d20+1)[10]