Bottom 'chin' stuck in place

Hey there! Got a T-Mobile G5 (H830) used a bit ago, and I wanted to swap the battery out as it’s clearly a bit worn.

But I’ve managed to find out that the chin is stuck in place! Pressing the button doesn’t do anything, nor does applying some torque and wiggling the chin around while pressing said button. It seems to be jammed in place somehow. The side opposite the button has a bit more horizontal give, but it doesn’t help much. I’ve attempted levering it out with a plastic pry tool but to no avail.

Does anyone have any tips on how to get it unstuck short of dremeling the thing to bits?