I think it's likely that it was PCP/Angel Dust they were on. Totally relaxes your body and gives you super human strength, but completely and utterly wipes you out of your senses.
It's quite clear they are completely out of it, because they keep saying to the police officers 'get the police, get the police', and the officers were saying 'we are the f***ing police, now calm down'.
The last time I watched footage of Swedish twins I needed some kleenex, this time i needed a blindfold...Having been to Sweden several times I can confirm they are an odd lot.
Being tranqed out was probably the reason they survived those horrific crashes! As for monging you out it does, but can also, if ya do enough make ya aggressive and enter a 'k-hole' where the above could happen!