What happen if defending hero get killed and the other two heroes are exhausted?

[Teck-Siong 0]

 If the defending hero get killed by 1 enemy, and the other two heroes are already exhausted, will the other engaged enemy still attack?  How do I resolve this situation?  Treat it as undefended and add wounded token to a hero (that already exhausted?)  Please help….

[Angus Lee 24]

The other engaged enemies that have not yet attacked this turn will then attack, and since you don't have any defenders, they are considered undefended attacks.

[Teck-Siong 0]

 Wow, then the exhausted hero will get wounded too…that is …so…arghhh….

Anyway, thank you for the answer.