The original report in SlimeKnights/TinkersConstruct#3857 mentions boots, so should probably have been reported here to begin with - in the analysis we determined that the same logic to calculate a velocity vector, with the same broken normalization due to the vecmath library, is duplicated in both mods.

The problem code for Construct's Armory is in https://github.com/TheIllusiveC4/ConstructsArmory/blob/master/src/main/java/c4/conarm/common/armor/traits/TraitMagnetic.java#L61