User blog comment:Yuri Rozu/Fairy Tail Chapter 499 Gray and Juvia/@comment-29693708-20160902163349/@comment-7418318-20160904204123

He could prevent a random small-fry solder from slitting her throat while she lies unconscious for example.

Or he could make sure that his ice magic keeps the wound closed, instead of running the risk of Invel disrupting his focus for long enough to lose grasp on it, resulting in Juvia bleeding to death all over again.

He could just be there for her to raise her spirit and make her want to survive, rather than feeling abondoned by her love and thus give up on life.