Beardedragon wrote:so.. the unit with paroxysm can still fight before the tyranid player uses adrenaline surge?
Yes.
The pdf is an attempt to clarify the fight sequence and the interactions of various abilities that allow units to fight first or fight last.
Perhaps i can help to explain:
The fight phase can be thought of as 3 distinct steps:
1) Fight first
2) Fight normally
3) Fight last.
Anything that happens at the "start of the phase", is resolved before step 1. Anything that occurs "at the end of the phase" (such as Adrenaline Surge) is resolved after step 3.
Multiple "fights first/fights last" abilities do not stack.
If a unit is "fights first" and "fights last" (such as a unit that charged - "fight first" and that unit is also subject to Paroxysm - "fights last") the effects cancel out and the unit instead "fights normally" (step 2). As "fights first" and "Fights last" do not stack, a unit with one or more "fights first" is still cancelled out by only one "fights last", and vice versa.
Any and all abilities (this includes units that charged this turn) that allow a unit to fight first means it fights in the first step. Identify all the units that fight first, then resolve those fights one by one, starting with the player whose turn it is, and alternating players, until all fight first units have fought.
Any and all abilites that make a unit "fight last" means it fights in step 3. Identify all the units that "fight last". THese units can not fight until everything else that is eligible to fight has done so (step 2)
Everything else "fights normally", in step 2, alternating between players, starting with the player whose turn is
not taking place.
Once Step 2 is completed, the "fights last" units will fight, alternating between players, and as was the case for "fights first", start with the player whose turn it is.
Additionally the PDF clarifies that the "Counter-offensive" stratagem ("fight next") can only be used on units which either fight first (step 1), or fight normally (step 2), and cannot be used on units which "fight last".
Hopefully this makes things clearer.