Esteber will defend himself by attacking the lizard in front of him. Also, seeing Herja is about to charge in, he will shout. "Herja, I think healing Bart is more urgent than rushing in melee right now!"
Rolls
Esteber's attack on lizard (MAT 13, +2 size, total CTN 15) - (1d20)
(18) = 18
Lizard's defense (DEF 16) - (1d20)
(7) = 7