Let the fighter stand toe to toe with the monster. You prefer to make your attack, then withdraw to safer ground.

At-Will   ✦     Martial, Weapon
Standard Action      Melee weapon

Target: One creature

Attack: Strength vs. AC

Hit: 1[W] + Strength modifier damage.
Increase damage to 2[W] + Strength modifier at 21st level.

Effect: If you move in the same turn after this attack, leaving the first square adjacent to the target does not provoke an opportunity attack from the target.

Published in Player's Handbook, page(s) 105.