The CW has released an official description for “Brothers in Arms” which is the Thursday, April 5 episode of Arrow.
Here’s the write-up with new spoilers:
OLIVER MAKES A DARING MOVE THAT COULD COST HIM EVERYTHING — Oliver (Stephen Amell) and Diggle (David Ramsey) face their biggest challenge yet. Curtis (Echo Kellum) is disappointed to find out his new boyfriend has a firm anti-vigilante stance. Mark Bunting directed the episode written by Sarah Tarkoff & Jeane Wong (#617). Original airdate 4/5/2018.