Suspense Flashback:

If you must include flashback in your story, design it for suspense, treating it as a proverbial Hitchockian "conversation with the ticking bomb underneath the table".

Set the ticking bomb under your flashback!

For example –

(A)

#suspense #flashback

Show a driver drifting to sleep behind the wheel while driving fast on a highway – or even riding a motorcycle in a highway, which is even more intense – and then let that character drift into a reverie about the past.

(B)

#drama #tension

As long as the audience remembers how the flashback started, it will keep building up unbearable tension.

Obviously, the flashback itself should have tension within it – it must have conflict, and the character's ability to take action may be suppressed.

(C)

#screenwriting

Additionally, you may find creative ways to keep reminding the audience about the deadly threat in the "world outside the flashback:

For example, you may superimpose the sound of tires driving over the highway shoulder, or something similar.

(D: End of thread).

#suspense