There is 75% pot left, so for me I am jamming here. I dont like to bet something like 50% pot and then leave him a small amount of chips left, so that I am getting 8:1, if he check-jam on me. The only other possible size for me would be a very small one, and with top two we are not going for thin value, so I dont like to pick a very small size.
Sure we could be beat by a straight or a set, that slowplayed the turn, but I think, its way more likely, we have the best hand, and I also think, enough worse
hands can call a jam. He can have a worse two pair, and if he was chasing a flush or straight and ended up with top pair instead, a lot of people wont be able to fold. Some might even get sticky and call down with KJ or KT, because they simply dont believe you. And whenever we have a nutted hand, we want to at least give people a chance to make that big failed hero call.
Its also still fairly early in a 45-man SnG, so there is no particular ICM pressure on either player yet. These are not expensive tournaments, and they run all the time, so for most people, if they bust here, they just play another one. This is not a spot, where we expect to see people making tons of nitty folds, but of course that will also depend on the player type.