Erfworld 66: page 60

[SteveMB]

Now Ansom will think he is the target and will call Jillian for support. But the tool will be smarter than him and go for something else. Without the fliers on the other side Parson can do a massive attack on the siege with basically no cost. He'll finish all siege, all battle bears and leave Ansom waiting for the battle that is not coming to him.

My guess is that the trap is not for Ansom but for the siege.

My guess
this turn: Ansom calls for Jillian
next turn: Parson finishes all siege and heavies and returns his force to GK

If Parson is planning to hit the siege and leave Ansom sitting out in the forest to stew, then why on Erf did he make such a point of Ansom now has "his boops in a vise"? Surely that is going to encourage Stanley to assume that their next move is to crack Ansom's group like a walnut, and insist on it if Parson suggests anything else.

Unless Parson is a total idiot at handling the Tool (and he isn't, as evidenced by his willingness to let him take credit for the trap), he's planning to hit Ansom (though perhaps he also plans to hit some or all of the siege as a bonus).