He's got a cell phone in his hand at the beginning of the conflict. But when he's struggling with 4 Border Patrol officers that's his Sig pistol in his hand. It's too big and bulky to be a phone.
Double column magazine service pistol. A Sig is usually an inch and a half wide. Wider around the magazine well. He'd be alive today had he stood on the sidewalk, waved a sign and chanted.
Instead he chose to get into a struggle with 4 armed men and draw his gun.