[El Paso by Marty Robbins] The Felina the narrator sees at the end is an hallucination

The story in El Paso by Marty Robbins is that the narrator falls in love with a mexican girl who works at his local bar. He never has the courage to talk to her until one day a handsome young man walks into town and starts flirting up a storm. They duel and the narrator kills the young man and then escapes, only to come back because he misses her. He gets shot and makes it to the back of the bar he always went, and as he dies he says that Felina found him and kissed him on the cheek as he passed. But, why would the song start with the lines

I was in love, but in vain I could tell

End with a situation like

From out of nowhere Felina has found me
Kissing my cheek as she kneels by my side
Cradled by two loving arms that I'll die for
One little kiss, then Felina good-bye

He had barely talked to this women it seems, not to mention murdered a man in front of her. And yet when she finds him in the back of the bar bleeding and dying, she would be craddling him in her arms and kissing his cheek? It could only be the loss of blood making him hallucinate.