1 item (1 fix)
A side-by-side follow slot must sit perpendicular to the leader's own heading, never perpendicular to the line between the two characters. The line-between-the-pair definition is circular, because it is built from where the follower already is, so each correction chases the last one and the pair collapses to single file. Measured error was 89.6 degrees from the line rule versus 0.2 degrees from the heading rule. Derive the slot axis from the leader's forward vector rotated 90 degrees.
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