Maybe I'm just unlucky. I tried killing a mounted mini-boss in chapter 1-3. Micaiah could only finish him of with Thani, and I'm reluctant to use it so early on. Edward missed twice and got himself killed, the emeny being equipped with a sword (Wind Sword).
Leonard cannot even scratch him as he's equipped with a simple Iron Bow, due to his low Bow level. Ilyana could drop him with Elthunder but she's also very much powerful. Me trying to strengthen Micaiah and Leonard led me to lose about 5 times until I had Soth deal with him.
Note, I haven't used the Save feature not even once, and I don't intent to do so. I think it's quite cheap.
@Words of Wisdom
Now that's a clever strategy! Thanks for the tip! 
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