Fans are getting new updates from Paul Blackthorne and Katie Cassidy via Twitter about some pretty intense action sequences coming up in season 4 of Arrow.

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Blackthorne, who plays Detective Lance on Arrow, recently boasted about the best action sequence experience he's had as an actor:

Cassidy, who portrays Laurel Lance, also posted a picture on Twitter from filming for a night scene with Blackthorne.

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Meanwhile, the teaser for midseason premiere episode, titled 'Blood Debts,' shows a distraught Oliver as the fatally injured Felicity (Emily Bett Rickards) is fighting for her life in hospital.

"Now I know it's not my fault, it's my responsibility, to end it I am going to kill him," Oliver's voiceover is heard through the clip.

Little else is known about the episode so far, but the rest of the season is being set up as quite the stormy conclusion for this chapter.

'Blood Debts' will air on January 20 on The CW.

Watch the teaser:

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