I've tried that before without luck because the spring goes up into the frame quite a bit, and the top has that outcropping to get over. Maybe you'll have better luck, but be careful!!! If you could get a grip on the 2nd coil somehow, you might be able to get the top one to move a little, but it'll be a sticky wicket
You might want to just drop it out to get a good look at everything anyway, and try to determine what happened.

i dont see how it could have happened either, but since it did, it would be nice to know why, so it wont happen again. i am guessing either the spring broke, the outcropping on the frame broke and/or something interfered with the spring keeping it compressed to the lower arm while the suspension was dropping.

i used to drive around with a pair of coils chopped 2 coils down, and they never came out of place... even driving over curbs and stuff...
With as much tension as was on the 6cy coils i put in last year, i dont see how they could just pop out of place. the arm has to drop considerably before tension is released... much more than can happen just with the suspension at full droop. The v8 springs i had in there before that were even longer.