Great hike!
Thanks for the great report; had a great time and learned a few new things. A few thoughts/questions:
When Joe went in, I noted (and Joe later confirmed) that the current was strong and immediately pulled his legs downstream, under the remaining snow/ice bridge, while he struggled...
" the only way to recover is to go back to the summit of Jackson."
You could keep heading down the Webster Cliff trail (hang a right at the junction of the spur path to Webster); I made the same mistake on a windy cold day this winter, makes for a longer descent but better than going back up...
I used my swiss bob sled to get down Wildcat D last year - are there other 4000' peaks in the whites that are good for sledding? - Tuck's is out for me :)
In my 5 years of hiking in the Whites, I have encountered moose on two occasions. The first was a benign cow/bull viewing from a trail by Lonesome Lake, (1st photo) the second a surprise encounter on Cabot. My wife called out something like "look at that steaming pile of...." when she was...