maybe they could use their strength to make one big leap at the beggining, but after this, they should be quite slow on land, they are water creatures, they shouldn't be this fast on land
not only this is silly, but some sprucecap who is able to make logical conclussions will think that a walrus will be slow on land, so they will decide to fight it thinking they would use speed to their advantage, but they would instead get a nasty surprise and get knocked out