Yes my previous reply was in response to Ualaa sorry for the confusion...

Golle it does cast Healing touch if the first one fails. This is because Barkskin can only be cast on yourself, it's and instant cast meaning it can be cast in the same line as a global cooldown triggering spell, if and only if the barkskin cast fails. The logic here is all toons target a mob, the mob targets toonA, press your button and toonA will cast barkskin on the targets target or in this case himself. ToonB will attempt to cast Barkskin on an invalid target (toonA) and will then cast the healing touch on the targets target or toonA. This works fine for me so not sure what is causing the problem for you. This only works for spells that are selfcast only. Other spells will do exactly what you stated and fail. You will also have a problem where toonA will continually try to cast Barkskin on himself because he is a valid target for the spell on cooldown which will exist the macro. This means it's a great "emergency" heal macro, not really a spam heal macro.