If Barbaracle with "Lost Block" Ability gets knocked out, do the opponent's Prize cards go into their hand or into the Lost Zone?
When Barbaracle is KO'd it goes to the discard pile; Lost Block is no longer in effect, so your opponent gets to take the Prize card.
Source: TPCi Rules Team (2022-10-06)

Relevant cards

Note: All applicable cards may not be listed below.
SWSH11_107
SWSH11_107