V2 almost certainly has AA or KK here. If he is frustrated / tilt-y, he is almost 100% looking to GII with a premium hand. If in fact, his thinking was "30 seconds", then I'm liable to believe that he is legit thinking about what to do. I do not think he has hearts at all, and is worried about a 4 flush beating him. He would almost insta-shove if he had an overpair that was a heart.
V1 could have a hand like A
Qx, which is like, the top of his range based on your reads. He could have TT and is looking to see what happens, and give himself a reason to fold if he knows he is beat. Maniacs are not blind to the situation. There really is no other hand we would even consider worrying about that V1 could have, thus, ship.