The horse whinnies in pain, lashing out again at the spider with its hooves and then retreating backwards as they attempt to close in. For his part, Quinn nocks an arrow, takes a deep breath, and looses it as the opportunity presents for a clear shot.

Spoiler: OOC
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Horse takes two hits for a total of 6 damage. Current hit points 7/13, putting him in his first wound threshold (grazed).

Horse fort saves (first without wounded penalty, second with wounded penalty)
1A: (1d20+5)[24]
1B: (1d20+4)[11]

Horse then attacks (attacking 1B first, then moving to 1A if necessary)

Hoof 1:(1d20-4)[13]
Damage 1: (1d3+2)[5]

Hoof 2:(1d20-4)[9]
Damage 2: (1d3+2)[3]

Horse then 5' steps back to O7 and ends it's turn.

Quinn moves to R7 and fires at Spider 1A. If spider 1A is somehow dead, he will shoot at 1B, although this would be at a -4 penalty.

Quinn attack on A1: (1d20+5)[24]
Damage: (1d8+1)[6]