Matchpoints. E/W are experienced.
Don't think it's relevant but South DID use the stop card but picked it up right after the 2H bid. West then made the immediate 3C bid (no more than one second pause).
I sat North. Several questions:
1. Should I have reserved my rights by asking whether all agreed that West did NOT pause after the pre-empt? (I did not do this.)
2. From a laws perspective, is this a UI situation identical to what arises after a long pause? That is, does the immediate bid mean we can challenge/appeal any actions by East if we think there are logical alternatives for East and that we might have been harmed?
3. Had I called you as the director, how would you have ruled? Are there logical alternatives for East over 4H or 4S?
EDITED to say "East" instead of "West" in question 3...thanks paulg.