What else can they do? They may feel sorry for him, a little.
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Well, they've seen Merlyn. It's too late to train. Now what?
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When Maseo collected Oliver and Diggle, he took him to Malcolm. Eeek.
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Maseo checks in on his prisoners. It's not like they can go far.
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Diggle tugs on Oliver's chain. No, really. See? He's yanking.
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Oliver, in a hood even before becoming The Hood, just beside Diggle. Did they even know each other?
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Diggle is packing some heat as he takes to the streets.
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There he is! Diggle is in the mix as he flanks Arsenal, Black Canary and Sin for the fight.
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Arrow Quotes

You know Oliver, somebody once told me that secrets have weight. The more you keep, the harder it is to keep moving.

Diggle

Ra's al Ghul: You tasted death and you wanted more, but the truth is everyone and everything must come to an end. Even for one such as me.
Oliver: Kill me, but spare John Diggle's life. Let him go. I will beg for it.
Ra's al Ghul: You have shown tremendous strength, fortitude, power. No, Mr. Queen. I don't want to kill you. I want you to take my place. I want you to become the next Ra's al Ghul.