Board Thread:Update Suggestions/@comment-28992768-20170201124258/@comment-25856498-20170417075434

An Eye for an Eye: In this challenge, there is some special mechanic: whatever you place down will automatically be matched by an opposing placement of the same unit but 0.5 seconds later. This mirrored placement is done automatically, and does not require the opponent to spend Elixir. This is true even if the opponent does not have the corresponding card in their deck e.g. if you drop a Hog Rider, an enemy Hog Rider will be spawned even if the opponent has no Hog Rider.

The mirrored placement mirrors your placement, so say if you drop units a tile from the bridge, the mirrored enemy placement will be a tile from their side of the bridge (but on the same side).

0.5 seconds is all that matters. It can settle the score between two identical but opposing units.

Special note: Buildings can be displaced if the mirrored placement of a particular building coincides with the opponent's placement of a building. It's similar to the mechanic in Clan Battles.