I am wondering if the captain was thinking that the #2 ADI was working because he had asked for #1 to be switched to ATT(#2 was switched to ATT instead by the copilot, for whatever reason quite possibly without the captain's knowledge).
Therefore in the captain's mind, when the 'bank angle' callout was made, he thought it was a false warning based on what he was now assuming to be the now unreliable #1 ADI(which was in fact reliable) and then didn't use or took too much time to use the standby horizon for confirmation until it was too late.
It certainly doesn't give you much confidence in crews when once again we hear yelling for Allah over and over instead of working to correct the situation. For those tempted to do so in the future, perhaps you could yell "gear down", "speedbrakes" and recovery techniques instead. I guarantee it will provide more help to you and your paying passengers in this life than Allah ever will.