Interesting bit brought up to me by a fellow local player. An X-wing T70 equipped with Pattern Analyzer dials in 4K facing the edge of the play area. Attempting to execute this manoeuvre, it places the fighter - say - half a baselength off the mat.  Now, which rule actually prevents the X-wing from using the Patter Analyzer to boost back into the play area, given that: - PA allows one to perform an action before the maneouvre is completely executed and before all the triggers firi