The first should have resulted in the judge declaring a mistrial. So he'd be on the line too.
I hadn't known about the testimony thing as I've not been paying attention, so yeah, changing his testimony is something, but it's not like that's the first time it's happened in any case and then it has to be proven, something that they'd be more adept at denying than DeBruin would be at proving.
DeBruin helping out Rittenhouse and screwing himself even further for the sake of the guy who shot part of his bicep off in an attempt to kill him is banking on a lot. And banking would be an issue as there's only so much GoFundMe can be hedged on to pay for attornies in suits for and against him. Needing round the clock security is costly, and unless someone is gonna do it hoping on a piece of the settlement (mind you, regardless of acquital, kid still has blood on his hands, so that mucks up the poor innocent boy part a bit).
"reckless display of a firearm inside a courthouse" is something of an irony given why Kyle was there in the first place. That'd be like Manson suing Bugliosi & Co for not preventing him from shaving his hair off (in terms of blades, that is).