Whitcomb also told GeekWire that he was not directed by Seattle Police Chief Kathleen O'Toole or Mayor Ed Murray's office to end outreach with Twitch.
The officers fatally shot Lyles with three of her four children present after she confronted them with two knives, police said.
"Our historic police reforms, from de-escalation training to civilian-monitored force review, are in place to address such crises".
The killing has prompted outrage among many, including Lyles' family, who questioned why the officers couldn't use nonlethal methods to subdue the petite woman, and suggested race played a role.
Even if he had brought the Taser, Anderson maintains in police transcripts it would not have been the "appropriate" tool for handling Lyles' abrupt and seemingly violent outburst toward the officers.
The officers were responding to a burglary report called in by Lyles and knew she had a history of mental health issues, and that she had menaced two officers with metal shears in her apartment earlier in the month. But it suddenly escalated with the officers saying "get back" repeatedly. Lyles told the 911 operator that her children were in the house with her.
'And at that point, fearing for what was about to happen, what she would do to me, um, being stuck in that spot, I fired my handgun, ' he told investigators, noting he remembered hearing shots coming from Anderson's location.
As he spoke, Whitcomb's avatar was moving around the digital world of Destiny but not shooting anything at the time.
Anderson, who joined the department in 2015, said he drew his pistol, asked for fast backup on his radio and, along with McNew, told Lyles to "get back".
Anderson said the conversation with Lyles began normally, involving what was missing in the apartment, before Lyles drew the knife as her "face changed completely". "They could have used other (less lethal) force".
After an online outcry, a Seattle Police Department video in which an officer playing a video game discussed the recent fatal police shooting of a pregnant mother has been removed from social media.
The shooting remains under investigation.