Partner, Ally, Friend
On my stage-check "mock checkride" the instructor had me land the R44 on a frozen pond....hard to say just how wide the LZ was but the helicopter is about 40 feet long (38ft 1" OAL and 33 ft main rotor diameter); I'd estimate the pond was about 100 ft x 75 ft surrounded by 50 foot trees on all sides. I did it but it was pretty tight for someone inexperienced like me. He told me afterwards "I was expecting you to say no to that". Problem is the thing will sink down to the belly in the snow most of the time, even with the bear paws on the skids. I usually only lower the collective about halfway and say "OK, unless we have a really good reason this is as far as I'm going to let it sink into the snow".