ちらと (translations)→ momentarily quick restrained
つかのま (translations)→ brief briefly ephemeral moment sufficiently
とっさの (translations)→ initial sudden unthinking
ふと (translations)→ abruptly accidental chance dare inadvertently instantly involuntarily just soon suddenly unbidden unexpectedly when
一瞬 (translations)→ bit blinking flash fleeting glance heartbeat instant minute next once sec second slightly split-second temporarily time