The England winger saw his low drive roll past Bart Verbruggen for the only goal of Arsenal’s midweek win.
There looked to be little danger as he took aim but the ball flicked off Carlos Baleba and Verbruggen could not re-adjust his feet.
Saka could only shrug and look quizzically towards home fans after the ball found the net.
Arsenal were strangely subdued and scored with virtually their only chance of the match, Saka receiving the ball from Jurrien Timber wide on the right before cutting inside and finding the net.
“I had an action before where I thought I could have been a bit more direct,” he said.
“When I got the ball next, I said, ‘I’m going to be direct and go for it’.”
Saka later fired off target and was dragged to his feet by Joel Veltman towards the end as the Albion defender sensed a time-wasting ploy.
The Arsenal star said: “We fought for it. In the end, we got the win, we got the result we wanted. We just feel good about it.”
“I did that, cut in and took a shot. I didn’t know how it went in initially, but a goal’s a goal so we’ll take it.”