General Zaroff and Sanger Rainsford are in direct, man versus man strife when they chase each other. Zaroff and Ivan are additionally in direct clash with every one of the mariners who have "unintentionally" wrecked on the island. Ivan and Rainsford likewise have an immediate clash.
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There are several things that distinguish heroes from monsters, especially in classical literature. Heroes and monsters are very highly contrasted through the dichotomy of good and evil. Heroes are often wholly good; monsters are often wholly evil. Being "good" entails protecting the wellbeing of others, and being "evil" means causing destruction and harm to others. They are also very starkly different in their physical appearance and personal attributes. Heroes, especially Beowulf, are bold, strong, physically fit, usually handsome, brave, wise, etc. Monsters are usually grotesque, horrifying, oversized, etc. Hope this helps.