PLO8 - First time ever and couldn't even show it

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What would you put the bettor on out of curiousity?

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One of:

set, low draw + pair, low draw + no pair, 2 pair. You're only afraid of low draw + 2 pair or better here. Even against top set, you have 48% equity on the flop (you're backdoor flush draws or an ace gives you some high equity.)

On the turn, if you could put your opponent squarely on a set, you would just barely not have the equity to call (28% when you need 33%). If there's a small chance he has something less, you have an obvious call. If he somehow had QT for the straight, you'd have 25% equity.