I am playing Black Fang Lair (Legendary) with Seoni and Harsk.
Seoni cast stride to move Harsk from Desecrated Vault to Temple. Harsk has moved to the new location and needs to discard one. I can select one and press discard, but then can't progress. The green arrow stays dull on Harsk and is unclickable. The green arrow on Seoni is glowing, but clicking it does nothing.
Android build ver 955-20170615