I kited the coast dwarves based on your video guide and it worked out great! Except for the part where I don't have enough mana, of course, but it turns out once they get far enough away from each other at 1% health after ensnare drops, they stop trying to chase me with pitchforks.
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Fun fact: There are actually two Signus Borans. The second one is by the chessboard near gfay.