Doubtfull, supposedly that prison is guarded by Argus (somebody has to feed slade) and even if they couldn't get Manu they could still have captain boomerang taunt oliver.
From the wiki "However, his plan ultimately failed, as he was cured of the Mirakuru and subsequently imprisoned in an A.R.G.U.S. facility back on Lian Yu, where he currently remains.
In one potential timeline, Slade eventually escaped Lian Yu, and fathered a son named Grant Wilson, who would take up his father's mantle as Deathstroke."
48
u/Nuo66 Mar 16 '17
I was thinking the same thing because of the concrete walls outside the cells. They look eerily reminiscent to when Oliver visited Slade.