I haven't read the comments, but it's obvious here that you take the sulfur and attack the orcs in the same turn. BlackKnight is a reasonable person; he wouldn't want the multiplayer match to end like this for his team.
Be that as it may, so far we only have the answer from the captain of one team, who said that yes, items that make it impossible to pass to the guard due to the terrain can be taken before the battle with the guard, and the guard must then be defeated. We haven't heard anything from the others. According to the Baev rules, by the way, such a situation is also possible, less often, but possible. And didn't you yourself, before the game with Alone, keep telling me that we need to play strictly according to the rules that RedWhite posted in the Interportal topic on HP, and what he meant and implied was none of our business!?