1/20 sec is too slow to freeze motion of people in a candid setting. ISO-6400 is pretty high for most any DSLR. The camera data says the flash didn't fire.

Consider a few points in the EXIF data and some technique adjustments:

1. Don't use AI Focus AF. The manual makes this AF option to seem like the best of all worlds, but actually it's the worst. Use Single-Shot or AI Servo AF.

2. If you have other shots from this setting with the flash active, make sure you have fresh batteries so the flash refreshes as fast as possible.

3. Consider 1/30 as the minimum for people if you can get them to 'freeze', consider 1/60 to 1/120 for freezing more candid shots of people.

4. If using a speedlight with the ability to manually control the flash output, work in Manual Exposure and practice finding the manual flash output setting in the 1/4 to 1/16 range that just provides the necessary fill-light. By lowering the flash output from 1/1 (100% full-power), the speedlight will recharge nearly instantaneously.

Canon Digital Photo Professional will read the EXIF data on Canon RAW (CRW, CR2, CR3) and SOC Jpegs produced by any Canon camera. Nikon View, will do the same for Nikon RAW (NEF) files.

Although, CHG Canon is right on about the settings, the photo was shot using Scene Intelligent Auto mode. AKA Green Box mode. In this mode, Canon cameras, that are equipped with a built in flash, won't work with an external flash. Putting anything in the hot shoe disables the pop-up feature of the build in flash. So the camera's AI chose the best exposure settings for a night portrait without flash. I think it's a pretty good shot considering the conditions, but does not show off the capabilities of the camera or lens used.

A number of factors need to be considered, including the exposure mode. Regarding your specific question, use the Zone setting, your middle pic and Canon's AI Servo AF for focus. The single point is more precise, but a whole lot harder to keep positioned on the eye of a moving subject.

What types of birds and what environment? You might try shutter priority at 1/1000 and Auto ISO as a starting point as a general setting for larger bird against a blue sky, say like geese or cranes in flight.