It won't automatically climb!
It won't "automatically" climb unless you are dual channel and Flare Arm. But provided TOGA is armed (and there's no way of telling) you'll get 15 degrees pitch UP, and if the A/T is in you'll get a handful of thrust.
Surely (Shirley?) you're not saying if I am at 2100 feet on the Glide with 2000 M/A set its going to go
down in TOGA.