We're arguing on how to interpret the rules in terms of the application of the Hide (in Plain Sight) skill and/or ability in combat.
Points of inquiry:
- attacking while hiding (e.g. make a check at the end of one's turn, after each attack, or..?).
- what actions can Hide take (other than normal movement or a 5-foot step) (e.g. being bullrushed is movement, is that grounds for a Hide check?).
re: being bullrushed: No, that'd be an immediate action. (Let me say right now, I feel unsatisfied with my ruling as Curmudgeon, as I mention at the bottom, would take such a better, rules-solid approach.)
re: as part of an attack, not Hiding prior (with HiPS): I'd allow this. (See above statement about Curmudgeon.)
re: "while attacking": I take this clause to mean that you decide to perform an attack FROM hiding. This action is impossible without already riding on a Hide check before-hand. In this case, the phrasing would be better worded as "attacking while hiding" rather than vice-versa. Then again, they mean the same, and your worries are gone. The clause this subclause is contained within I would generalize as addressing the penalty applied to Hiding while performing a noisy action.
I'd go with one Hide check after an attack sequence.
re: contact detection: what is this called in real life when we feel something and know the general direction the feeling originates from? I rule the victim <verb> a cone in the direction which their character senses the attack originates from.
Somatosensory research is required for appropriate nomenclature.
I highly recommend seeking wisdom from "Curmudgeon" from the GitP forums. Their deduction is uncanny.
P.S. In my case, I use the "Blend into Shadows" feat (DotU) which has its granted ability as a swift action, i.e. without spending a swift action on anything else, it leaves out the question of how many Hide checks are required for hiding while attacking since I can make one at the end of the turn (for better if the GM rules the requirement of a Hide check per attack). On that note, do people generally allow swift actions and the like to be taken as longer actions such as a standard action? In this case, it would allow the performance of two swift actions (by sacrificing one's standard action), and three if you allow the tribute of a move action as well.