Arctic Beam goes around corners

[offsetcyan]

I don't understand if this is a bug or instance of bad game design. I was hiding inside the base, mid lane at ground level next to the towers, and Kelvin's beam was bending through the doorway to slow and damage me.

 

[offsetcyan]

Nevermind, the beam "ricochets" off structures (lol). Inane but not a bug, it was just a visual artefact that it looked like it curved.