There's no way she's going to be able to keep on wrestling him like that for much longer. My 10yo is nearly as big as me. De-escalation is the only way and that has to start before he truly starts to kick off. That's tricky in the ebb and flow of a normal day and we don't always get it right.
Tracey looks absolutely knackered. Poor woman is so resigned to being bottom of the heap, isn't she? She's living in an abusive situation, but rather than doing it to her directly, her partner's sitting back and letting their son do it to her.