What causes a stock to make an EXTREMELY big move in a short period?

It took one second for REDU to jump from $6.95 to $7.48 on minimal volume. I saw no news to warrant this.

The B/A spread was tight and it traded over 4 million shares today so volume and spread weren't factors.

I can't say that someone is manipulating the market but this quick price rise is odd because it's hard to believe that the order book is so thin that it can gap on bare minimum volume.

In a situation like this, when a stock gaps and you have a stop loss order within the gap, you're out of luck. There's no way avoid losing the amount from your stop loss price up to the opening price after the gap.

Low priced stocks tend to be more volatile, often more so after an earnings announcement which happened to be yesterday. You've witnessed that here.

This is common in low priced stocks

It changed 10% but went up by $1.04. Having a low price makes the stock more volatile for a few reasons.

It's cheap. The barrier to entry is extremely low, so professionals and armchair traders alike can pick up a lot. As a counterpoint, Google is ~$1500 a share, far fewer people will "take a chance" on it.

You need to Cover Commissions and make money. Sometimes commissions are a cut of the price, but most of the time commissions are a flat fee in stock trading. A 10% swing in google's price is ~$150. Your stock 10% swing is ~$1. This means you either have to own a substantial amount of stock or the price swing has to be higher to make it worth exiting a position.

Once you combine the fact that investors with no clue what they are doing can buy and sell on a whim, and that professional investors have to buy a decent chunk of a low-priced stock to make it worth their while, it's much easier to see why the price can swing much more. A large investor entering or exiting a position would have a noticeable impact on price.

Armchair traders who decided to buy the stock because they added ".com" to the end of it, then dumped it when they realized it wasn't a website are another way larger swings are possible.