Why would SLJB want to crash their own stock?
They probably didn't really WANT to, but they certainly at least had an effect. You'd better take a look at Sam's trading records, bearing in mind that there are four other similar accounts. Stock was journaled into these accounts, and then dumped over a period of days or weeks. Massive amounts. Every time they ran out of stock to sell, more millions were journaled into the accounts.
You can't sustain stock price forever if you're doing that. On the other hand, they made a lotta money.