Locked horns can often lead to Moose death during the rut----"Kris Hundertmark, chair of the biology and wildlife department at the University of Alaska Fairbanks comments that male moose compete for females by clashing antlers and pushing against each other during the fall breeding season".............. "Adult male moose are extremely strong and their large antlers often have “complex” shapes that can become so entangled that the animals cannot dislodge themselves from their opponents"............... Hundertmark said the only ones he’s seen are skulls of conjoined moose found in the wild — but not in ice as was the case just recently outside of Unalakleet, an Alaska town on the coast of the Bering Sea"................See pictures below of the end result of what must have been an epic encounter between two adult male bull Moose, "leaving it all out on the field" for the right to breed and pass on their genes

https://www.google.com/url?rct=j&sa=t&url=http://www.atlasobscura.com/articles/found-two-moose-frozen-together-in-a-final-battle&ct=ga&cd=CAEYACoUMTMyOTE0ODkzMzE2MDYyNDM5MzMyGjNiYjU3MDBkYmE0ZWU1MmQ6Y29tOmVuOlVT&usg=AFQjCNGeZHFL66vULHO6GXC7Gg_Osn7Vew

Found: Two Moose Frozen
 Together in a Final Battle:
They died fighting     By Sarah Laskow
 NOVEMBER 15, 2016

“It appears that one of the brow tines
 (on the antler) penetrated and may have
ended this (battle) fast, leavingthe ‘winner’
with a 1000 lb headdress and probably pulled
his head into the water where he drowned”