Action to me then.
I was going to charge the door but the rules are a bit wooly. It would be strength + something or Unarmed Combat (UC makes no sense as its an uncontested hit on strength but UC is agility.) So 7d6 +2d6(charging). Let's say that's 2-3 successes.
Page 198 has examples of shooting or magicing doors but none of kicking that sh*t down. Marcus thinks this door is a standard door, Str2 Arm4. Kicking the door successfully is Str(5) + 2 hits (let's say). This means that the best he can do is destroy the door but he would be left with only 1 remaining on the other side and then he's a target for 1 pass unless he finds cover.
Thoughts and rules calls?
Depending on judgement of above rules check, if he thinks he could get through the door and not be a target, FPs intended action would be the below
Free: Communicate sotto voce "Charge"
Complex: Charge the door
Move: to where ever FP saw cover inside
other wise:
Free: Communicate "Viso, wanna check on Byte?"
Simple Action: draw a sword
Simple Action: ready the flash pack
Move: to outside door jamb