Mounted Combat and Full Attack With Bow

[kerbarian]

That's exactly the question my zombie example addresses - how long does the non-threatenedness last? (See previous reply to Artoomis.)

Having the non-threatened status last only until you leave the square seems reasonable, but I still don't think it addresses the readied action issue. In my example, player B could move through the squares before player A actually moves at all and still get the benefits of the squares being non-threatened. You could even contrive an example where player B safely dashes through after player A has moved 5' of the 10' required to get out of those initial threatened squares.

 

[kerbarian]

P.S.
Also Kerbarian: The withdrawing horse and rider (A) would draw an attack of opportunity for the 2nd space it moved out of from the spiked chain wielding enemy.

Oops, you're right. I meant for the corridor to be wide enough that player A could move straight left away from E. The example as written still works for player B being able to sneak through undamaged, though.