The Attack on Deke Shaw was an attempt by Sarge's Squad to kill Deke Shaw under the mistaken impression that he was infected by a Shrike, which was prevented by S.H.I.E.L.D..
Background
After his arrival on Earth, Sarge’s Squad was hunting Shrikes, parasitic creatures infiltrating Humans’ body, who had the mission to assemble at a certain place before the arrival of their creator who would cause the destruction of Earth like they did with Chronyca-2. Sarge’s Squad tried to eliminate every Shrikes by finding every hosts, such as Harold Simcoe, and by killing him by planting him with a knife.
Their scans accidentally locked onto Deke Shaw, who they mistook for a Shrike host due to the fact he read as an off-worlder; this reading was actually due to Deke being from an alternate future.
Attack
Sarge’s Arrival
Deke Shaw meeting with "Phil Coulson"
When Sarge arrived at Deke Shaw’s office, he pretended to be here for a professional rendezvous with Shaw. Trevor Khan warned Shaw that he was waited in the conference room, even if the rendezvous was in advance and that Shaw isn’t ready. So Shaw came into the conference room and was surprised to see Phil Coulson standing in front of him with a darker style. Shaw asked some news about how he was still alive and saw that Sarge didn’t know. Shaw thought that Leo Fitz and Jemma Simmons wiped out his memories but when he asked about how is agent Doug, who doesn’t exist, and that Sarge answered positively, he understood that he wasn’t talking to Coulson. He tried to run away naturally but Sarge grab his arm and threatened him but telling him he should not be here. Shaw took a piece of glass on the conference table and pierced his left hand with it, that confirmed he was not Coulson.
Chase of Deke Shaw
To be added
Aftermath
To be added