Seeing Isphet fall, Avardis shouts, "NO!". With a roar, he charges at the merchant's attacker.
If the axe-wielder is far enough away, do an actual Charge. Otherwise just close with him.
If charge: +3 melee (1d10+1 slash 19-20/x2) AC 17
Otherwise: +1 melee (1d10+1 slash 19-20/x2) AC 19