I don"t see why it"s such a stretch for v2 to have 78s, 89s and T8s in his range here. They"re all pretty standard call pre for the initial raiser (since v1 is bad, v2 has position and a playable hand - plus we"re plenty deep enough) and then when hero 3bets here, his range is prob ultra-strong (QQ+, AK+ ??) which boosts v2"s implied odds and that"s what SC"s are for. I"m sure he wouldn"t be over the moon about getting 8bbs in pre with these hands but I think with these hands pre for each of v2"s decisions calling is better than folding.