In the tragic vision, the possibility of a happy ending is unrealized, although it is sometimes suggested, as when Lear is briefly reconciled to Cordelia. When tragedy pauses to look at comedy, it views such a happy ending as an aborted or by-passed possibility.
Tragedy tends to exclude comedy.
In the tragic vision, something or someone dies or lapses into a winter of discontent. The catastrophic conclusion will seem inevitable. It occurs, ultimately, because of the human limitations of the protagonist. The protagonist suffers terribly. The protagonist's suffering often seems disproportionate to his or her culpability.