Telefrag

"Telefrag" was a term used by Earth Empire Marine Corps in the 34th century for the process of transmatting into the same position as someone else — the result was death. (PROSE: The Dark Path) On 20th century Earth, the Seventh Doctor altered the Imperial Daleks' transmat to perform a similar function by forcing "one half of the Dalek to materialise where its other half was materialising. The two halves tried to coexist at the same point. The resulting reaction destroyed it. (TV: Remembrance of the Daleks)