Two things to remember in all this.
1st.. We are talking about attacks of opportunity which meanings the check is to determine whether you lower your defenses enough to allow the opponent attacks beyond their normal capacity. The nature of who you are tumbling by doesn't necessarily affect your capacity to maintain your focus.
2nd.. Any high level fighter that is being flanked by a rogue and being killed by sneak attack is a fool for not having fortified armor. If you are a frontline fighter fortification is a must or you are subject to every rogue and freakish crit that comes along.
I just have not experienced that much abuse of the tumbling because the enemies I use against my player's are prepared for these obvious and common techniques. Just because as a Dm tumble froces you to grant the player flanking doesn't mean you have to grant the sneak attack.
1st.. We are talking about attacks of opportunity which meanings the check is to determine whether you lower your defenses enough to allow the opponent attacks beyond their normal capacity. The nature of who you are tumbling by doesn't necessarily affect your capacity to maintain your focus.
2nd.. Any high level fighter that is being flanked by a rogue and being killed by sneak attack is a fool for not having fortified armor. If you are a frontline fighter fortification is a must or you are subject to every rogue and freakish crit that comes along.
I just have not experienced that much abuse of the tumbling because the enemies I use against my player's are prepared for these obvious and common techniques. Just because as a Dm tumble froces you to grant the player flanking doesn't mean you have to grant the sneak attack.