Lex deals too much damage to fight on your own. If you're under attack from him, use Shadow Travel and move to a safer location, then regroup with your team.

Try to wait until Fernando's shield is down before ulting, as it will block the line of sight of the ult.

Ruckus is vulnerable when he uses his ult. Remain out of his focus and shoot him down.

When Inara is using the Treacherous Ground talent, keep your distance from her. If you get caught in her Warder's Field then you'll have no good way to get out.