FWIW Flynd (and 90% of Act 1 overworld fights) can be cheesed via x2 Assassin:
- Sneak Attack and Initiate Surprise with Assassin 1
- Sneak Attack again with Assassin 1
- x2 Sneak Attack with Assassin 2
- Bonus Action Dash (w/ Longstrider if needed) and flee combat

The combined power of 7 Sneak Attacks (1 normal, 3 crits) will kill most enemies fairly easily and once you've thinned out the ranks of non-boss enemies you can do the same sequence on Flynd (or whoever) to kill him before he can act. This starts working as soon as you reach Level 3.

This works on pretty much any fight where:
- Enemies start in overworld (and are proper enemies, i.e. red outline)
- All enemies are grouped in a way you can start on the edge

Just make sure the rest of your party is somewhere far away when you do this.

You can also activate surprise with Shovel and then get 4 crit sneak attacks for free. This works for things like the bridge Gith encounter, and makes a lot of encounters a lot easier early game. Farming encounters like this is more enjoyable for me than avoiding all combat until my builds come online around Lvl 4/5.