SPOILERS for those not caught up on Arrow ahead.

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The trailer for next week's episode of Arrow shows Oliver (Stephen Amell) and Diggle (David Ramsay) coming to blows over the Green Arrow mantle. It appears that Team Arrow is about to become more fractured than ever. The friendship between Oliver and Diggle is sure to face an enormous test.

On last night's episode of Arrow, Team Arrow allied with Nyssa (Katrina Law) to stop a rogue faction of the League of Assassins from discovering the whereabouts of three Lazarus Pits. Against the wishes of Oliver and Roy (Colton Hayes), Thea suited up to help Nyssa in her fight against the Assassins. At the end of the episode, Thea chose to continue helping Nyssa instead of starting a new life with Roy. Roy decided to go with her. Thea's departure from the series was confirmed by the Arrow showrunner.

Related: Thea's Departure Should Be The Beginning Of The End for Arrow

The CW has now released a trailer for next week's episode, titled "Brothers in Arms". In the promo, fans can see Oliver clashing with Diggle over being the Green Arrow. Apparently, Diggle is resentful that Oliver hasn't relinquished the mantle after having to temporarily take it back. Oliver doesn't believe that Diggle will get "bent out of shape" over his decision but is proven wrong when a stare-off turns into a fist fight in the Arrow cave.

Tension between the two over the Green Arrow mantle began to show when Diggle first brought up the fact that Oliver has yet to give the suit back. Diggle raised the issue again in last night's episode. Oliver explained that he didn't think Diggle could handle Diaz and his men alone. Oliver confessed to Thea that he chose to keep the mantle after discovering that his son was able to accept it. Oliver admitted to feeling "complete" when being the Green Arrow, and it's unlikely that he's going to give it up anytime soon.

It remains to be seen what the ramifications will be for Oliver's upcoming fight with Diggle. After losing Curtis (Echo Kallum), Rene (Rick Gonzalez), and Dinah (Juliana Harkavy), Team Arrow can't afford to suffer any more loses. The group has already been reduced to the original trio of Oliver, Diggle, and Felicity (Emily Bett Rickards). The fight could lead to Diggle quitting Team Arrow and joining the other vigilante team. If fighting with Diggle costs him his best friend, this step could potentially be what takes Oliver to "his darkest place yet".

Related: Arrow Season 6 Finale Will Feature Sara Lance

Arrow continues Thursday, April 5 with "Brothers in Arms" at 9pm ET on The CW.

Source: The CW