Q: What is /assist command?

R: an option to target someone target. /assist <target> and you will change your target to your target target.

Q: How to visual it?

R: I was thinking in something like FFXII virtual lines from your party members (only who you want to show it), something that u can turn off if you dont like it. This way you can see your desired party members targets. For example using /assist <tank name here> on|off

What do you guys think? is a good way to see our members targets or do you want to keep our traditional /assist to change your target?