Effects - Is something wrong with the crack???

[beena]

Hope i'm posting this in the right forum: Basically several hours ago SWIM and her boyfriend relapsed and bought some crack-cocaine and some heroin (more of the former than the latter). SWIMs boyfriend has mainly been piping the crack (SWIM thinks he may've had one line of H) and SWIM also has had a lot of crack (a little H too).
About an hour ago SWIMs boyfriend began feeling really cold and started shivering. He's now laying on the sofa with a duvet over him, half sleeping. SWIM is awake but her joints have begun to ache (almost like the onset of heroin withdrawals - but there is no way that that is possible).
Can anyone think what in the crack might've made SWIM and bf feel this way???

Oh yeah, there's a few shiny little fragments in both the coke and h, which look like bits of sugar, only much smaller.