My apologies for making a rather quick remark on my mobile and assuming that our members are smart enough to gain information from context. Let me make my points clearer;
Stall, at the moment, breaks ASB Substitution logic. Let's use an example;
Stallmon: Revenge [STALL] ~ Revenge [STALL] ~ Revenge [STALL]
IF you are burnt when you are to act THEN Facade [STALL]
This sub is, as it stands, illegal, because it attempts to turn a -4 Prio move into a 0 Prio move. ASB Chance Substitutions prevent this from working as to prevent silliness. However, the logic doesn't hold here - there's no reason that Facade [STALL] shouldn't be usable in this instance - both moves
want to act at the same time. This is confusing (Especially for someone new, since it doesn't act like in-game Stall) - especially since the reverse is legal. Because we use Priority to determine when the move acts in comparison, and Stall currently outright ignores priority, we get a lot of these bizarre scenarios. We would either have to add clarifications to our substitution system to account for Stall, or change Stall so it's a non-issue.
For the record, some solutions to Stall will leave the above example still illegal - such as simply moving the move to the end of it's priority bracket - but they will at least make more sense to most users, since it'd be consistent with in-game rules. If Stall interacts with Priority, it also allows us to eliminate odd issues involving multiple Stall users, which we currently have to use an awkward codification to resolve.
As for me mentioning Sableye - it's not a thick idea to consider Sableye when we're considering changes to Stall, since it's the only user. Also a wee bit of tongue-in-cheek.
Finally, I've yet to see any evidence that suggests this would be a
Nerf. We might change it, but continuously referring to an unspecified change as a nerf will not make it a nerf -_-'