Other than the guy who's neck he broke who has Arrow killed?
I'm betting that the guy who shot Oliver on the island is Deathstroke. It makes sense since we saw his mask on the island right before Oliver got off it.
Ratings remain good:
The CW’s Arrow stayed on target this Wednesday night, matching its premiere rating of 1.3 and besting NBC’s 8 o’clock comedy block (which averaged a 1.2).
And though the action-drama dipped 15 percent in total audience (to 3.5 million viewers), it actually rose week-to-week in both the Men 18-34 and Men 18-49 demos.