I'm giving one of the other players permission to move Derek this turn since it's taking a bit too long and this is a test.
Try not to suicide him tho.
Derek to L8, overwatch if he still has the appropriate number of actions.
Derek could also
Hunker Down behind that rock, since Sectoids have 60 aim and hunkering in half cover gives 60 defense; that totals out to a 1% chance for them to hit him normally. And they can't flank him, plus the Aiming Angles option hasn't been selected (that I know of, anyway). The only thing they could do is come out to the fence to get a point-blank plasma shot on him, or use
Mindfray/Psi Panic. Coming outside to get at him gives us a perfect shot, though.
The real problem is that all the Sectoids are on the northern edge of the house, meaning that he's gonna have one hell of a time actually getting an angle on these guys right now. Even a blue move to that wall will still make him unable to sidestep left to get a flank in the same turn, since there's a fence right in the way. So yeah, moving to
L8 behind that tree and playing it safe for now is probably the best move.
By the way, Andrea is likely going to try and swing around the bottom of the house to get a flank through the window (assuming there is one, which there should be). Crazy should probably do the same. We just need to watch that Sectoid F; if he moves down, we're in trouble. Everything could fall apart if Arthur's AP grenade doesn't work right. We need that grenade.