[This is... So incredibly outside of Lance's realm of expertise, but he's still determined to figure something out.]

Can the two of you communicate in any way?

[Because if so, that might make things easier.]

And do you know what calms it down? If you're able to do so, it may be easier to discern how much of the anger is coming from it and how much is your own.

[And therefore easier to develop and implement a strategy for managing it.]