Catch
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summary: knowledge of the positioning (and the composition of the drowned one – Nelkin had wings) combined with information about a large number of angels and the red creatures moving around, conversely, did not allow the blue player to position themselves for an attack before the "suspicious" move.
therefore, everything is fair! :) the time passed before Gurney decided to position for an attack (between 145 and 146, at the end of which the blue player positioned and was vulnerable to the red creature... however, this is no longer important))))
You are missing one point. The delay of the turn occurred between 145 and 146. Nelkin received wings only on 147. That is, he could very well have expected that Nelkin did not yet have wings, so positioning for an attack from that point of view was quite normal.