Spoiler: Surprise half-round and Round 1, Philemon's Statistics
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Philemon Cooper
Male Neutral Good Human Ranger (Skirmisher/Guide), Level 1, Init 2, HP 13/13, Speed 30 ft.
AC 17, Touch 12, Flat-footed 15, CMD 16, Fort 4, Ref 4, Will 2, CMB +4, Base Attack Bonus 1
Shortbow (w/ 20 Arrows) +3 (1d6, 20/x3)
Scale Mail (+5 Armor, +2 Dex)
Abilities Str 17, Dex 14, Con 14, Int 10, Wis 12, Cha 7
Condition None

"He's not friendly - poke him through with holes!" cries Philemon as he tries to do just that...

Spoiler: Mechanics
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Phil will attack once during the half-round and once again in the full round 1. After that he's not inclined to give the ogre a good opportunity to Cleave the PCs, so he will move to the side at least 10-ft away from the next nearest ally (further is acceptable, as long as everyone is within about 50 ft of him).

Two attacks - Shortbow: (1d20+3)[22] to hit, (1d20+3)[23] (20/x3), (1d6)[5] piercing damage, (1d6)[5] critical strike damage.
(1d20+3)[19] to hit, (1d20+3)[14] (20/x3), (1d6)[5] piercing damage, (1d6)[5] critical strike damage.