If I understand @stevecotton's suggestion in https://github.com/wesnoth/wesnoth/pull/8830/files#r1586875368 correctly, there appears to be an unintentional possibility for Abhai to appear before the tentacle enemies in the underground lake. By applying the suggested event, the player is forced to trigger the tentacle event first, thereby eliminating the need for Abhai to have specific dialogue for the appearance of the tentacles.
My main reason for wanting this is so that the unit stops at the edge of the lake when they see the tentacles, rather than getting stuck in the middle of the lake.
Describe the desired feature
If I understand @stevecotton's suggestion in https://github.com/wesnoth/wesnoth/pull/8830/files#r1586875368 correctly, there appears to be an unintentional possibility for Abhai to appear before the tentacle enemies in the underground lake. By applying the suggested event, the player is forced to trigger the tentacle event first, thereby eliminating the need for Abhai to have specific dialogue for the appearance of the tentacles.