Cilene

Weighing the two most obvious options, Cilene decides to embrace the mantra of "Making ones self the primary target".

She looks ahead, shrugs at the others, then bolts off towards the giant, calling out to it, "You look like you've seen better days! Could you use some aid?"

Spoiler
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What's that you say? Diplomacy? Of course! We know how charming Cilene is.

Diplomacy: (1d20-2)[3]
Spot: (1d20+7)[11]

Gotta keep the eyes peeled, maybe it's got something stuck in it's back. Maybe he's just mean - or a giant monk who flogged itself. Who knows?