This hand happened awhile back and it's been in the back of my mind.

5/10 nlhe Live setting.

utg1 limper 1.6k eff. (Huge whale who likes to l/rr any two cards.  He just limp/raised A6o an orbit earlier.  Just wants to gamble)

utg2 reg raises to 70 2k eff. (Very competent player, plays very big online HUNLHE I don't know if I can say his screen name on here?)

Hero mp1 AKo 2k eff. calls. (Obviously just calling to let the whale l/rr)

Folds around to the fish who makes it 410

Reg in utg2 flats 

Hero? 

This is purely a speculation of how wide we think the regs range is for flatting?  He will probably flat QQ+ a lot because he wants me along for the ride.  But is it much wider?

Thanks