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So the tidewalls stat line has 0 movement characteristic but if the embarked unit completes an action in the movement phase the the wall can move normally as if it had the move characteristic of 8" with fly. Below. And expanding empires sector E tenent gives fly units 2" additional to their movement characteristic. Below also. Does that mean the "move as if it had a move characteristic of 8" and had the FLY keyword" is increased to 10" due to the tenet?

" Mobile Defences: Units from your army can perform the following action:

‘Mobile Defences (Action): At the start of your Movement phase, one unit from your army that is embarked within a TIDEWALL TRANSPORT can start to perform this action (even though units embarked within TRANSPORTS cannot normally perform actions). The action is completed at the end of that phase. If this action is completed successfully, that TIDEWALL TRANSPORT can make a Normal Move as if it had a Move characteristic of 8" and had the FLY keyword.’ "

" TURBO-JETS
Add 2" to the Move characteristic of models with this tenet that can FLY. "

Tenents are a Detachment ability, so the Tidewall would not benefit from it when taken in a Fortification Detachment as Fortification Detachments never gain any Detachment abilities

Damn, fogot the whole detachment rules thingy.