[Garbar]

The first one Will not target the mob attacking the healer. It will assist your defensive target AKA /assist Target defensive (%td), the healer could be targeting anything. I highly suggest just makeing a /cast taunt /cast Shield Bash + cast taunting strike for the best agro macro you can get.

Other macros are sound. But IMO you shouldnt say stuff like "this macro will target the mob attacking the healer." Since not all people will have the option to change there offensive target when they get hit. I know i dont.