Ment
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Nikta skip, let them approach closer.
Fai seems to be able to shoot up to the first one – in that case, fire a physical magic arrow 2 (if the rat didn't have visible resistances/armor when we attacked it last time. If it did have resistances/armor, then try an energy beam).
Never mind, Fai can't reach, it's more than 15 cells. Then he casts acid puddle 2 on the path of the second one (4 cells to the right of the second one), if the range is also 15. Let's hope they're not too smart.
If the range of the puddles is more than 15 cells, then cast it directly under the second one.
Dorobo skip.