I’ll refer you to two previous answers of mine. The first covers a few examples of what combat “looked like” during the landing in Omaha Beach, fighting in the hedgerows, and for formations at the head of the pursuit following Operation COBRA: https://www.reddit.com/r/AskHistorians/comments/elu8to/were_ww2_battlefields_as_full_of_dynamism_as/?utm_source=share&utm_medium=ios_app&utm_name=iossmf

The second covers a specific piece of footage taken at Omaha Beach as the 16th Infantry Regiment of the 1st Division came ashore, and addresses why the soldiers shown are walking upright even as half of them are shot: https://www.reddit.com/r/AskHistorians/comments/evsev0/why_dont_people_seem_more_panicked_in_this_d_day/?utm_source=share&utm_medium=ios_app&utm_name=iossmf

The first link also includes a link to a previous answer by u/Georgy_K_Zhukov in which he discusses the phenomenon of apparently bloodless combat footage as well as how and why movie portrayals of combat look the way they do, and that answer includes a hefty amount of discussion on that topic. That answer by him should address a good deal of your question as well.