Elisha heals the water of Jericho after crossing the Jordan, reminscent of the healing of the waters of Mara after the splitting of the Red Sea. Elisha's first act - healing the water - sharply contrasts Eliyahu's first act of decreeing a draught. Elisha's harsh reaction to the youth who taunted him reflects the message that was said to Elisha regarding his master Eliyahu. The question of Eliyahu's immortatlity is evaluated within the corpus of Tanakh and in the sources of the Sages.  

Courtesy of the Virtual Beit Midrash, Yeshivat Har Etzion