Heheh as a wiz soloing you have two options. One is to nuke or DoT something, have it charge you, and you melee it while HOing. You can actually gun down reasonably big mobs this way, but usually *not* bigger group mobs. Many green ^^s will eat my lunch if I do this.
For those I root dot. Dots usually don't break root. You root, then cast dots... and wait... and watch them on the left for time running out - redo root and redo Dots... and wait... and oops root broke - do not turn on melee - just reroot and back off. Okay that hurt, yer down 1/3 health. Redo Dots... and at this point roots will basically hold & you win. Or they dont and u have to run.
If yer fast about yelling, turning and hitting sprint and running, you can often get away. As long as u yell and end conflict u start regening power at a high rate, esp if u are using player made drinks - but sometimes u die. That's how I solo.